GUI troubleshooting: Difference between revisions

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[[Category:GUI manual]]
= GUI Troubleshooting =


This page provides troubleshooting tips and debugging techniques for the VoIPmonitor web GUI.
This guide covers common VoIPmonitor GUI issues organized by symptom category.


== GUI Debug Mode ==
== Quick Navigation ==


The GUI debug mode allows you to see SQL queries and other debugging information directly in your browser's Developer Console.
{| class="wikitable"
! Category !! Common Issues
|-
| [[#Access Issues|Access Issues]] || HTTP 500, blank screen, single user cannot access
|-
| [[#No Data Issues|No Data Issues]] || No CDR for today, empty dashboard, missing calls
|-
| [[#Database Issues|Database Issues]] || Timeouts, corruption, connections, schema errors
|-
| [[#GUI Upgrade Issues|GUI Upgrade Issues]] || Cannot login, blank screen, VM Binary error
|-
| [[#Permission Issues|Permission Issues]] || Ownership errors, NAS access, binary execution
|-
| [[#IonCube and PHP Issues|IonCube/PHP Issues]] || Loader errors, temp directory, PHP version
|-
| [[#Other Issues|Other Issues]] || Timezone, fax, attachments, RRD graphs
|}


=== Enabling Debug Mode ===
== Access Issues ==


To enable debug mode in the VoIPmonitor web GUI, '''add the parameter <code>?debug=31415</code> to the end of any GUI URL'''. For example:
=== HTTP 500 Error ===


<code>http://your-server/voipmon/admin.php?debug=31415</code>
'''Client-side steps (try first):'''
# Different browser or incognito mode
# Clear browser cache (Ctrl+Shift+Delete)
# Disable browser extensions
# Try from a different network


This enables the following features:
'''Server-side diagnosis:'''
* SQL queries executed by the GUI are logged to the browser's Developer Console
* Additional debugging information is displayed for dashboard panels and charts
* Performance timing and query execution details become visible


=== Finding SQL Queries for Dashboard Panels ===
<syntaxhighlight lang="bash">
# Check Apache error log
tail -100 /var/log/apache2/error.log    # Debian/Ubuntu
tail -100 /var/log/httpd/error_log      # RHEL/CentOS


To see the exact SQL query executed by a dashboard panel:
# Check PHP-FPM log
tail -100 /var/log/php-fpm/www-error.log


# Add <code>?debug=31415</code> to your GUI URL and navigate to the dashboard
# Check SELinux
# Open your browser's Developer Tools (press F12 or Ctrl+Shift+I)
getenforce
# Switch to the '''Console''' tab
# If "Enforcing", try temporarily: setenforce 0
# Interact with the dashboard (e.g., refresh, change time range, or hover over panels)
</syntaxhighlight>
# The SQL queries will be printed to the console log
 
The queries appear in the console in the order the panels are rendered. If you need to isolate a specific panel, hover over it or interact with its filters after loading the page - this often triggers a re-query which will appear as a new entry in the console.
 
=== Disabling Debug Mode ===
 
Simply remove the <code>?debug=31415</code> parameter from the URL, or navigate to any GUI page without it. Debug mode is not persistent and must be re-enabled each time by adding the URL parameter.


== GUI Upgrade Issues ==
{{Tip|For detailed SQL query debugging, add <code>?debug=31415</code> to any GUI URL and check browser console (F12).}}


The following are common issues that may occur during GUI upgrades and their solutions.


=== VM Binary (binary missing) Error ===


If you encounter an error message indicating "VM Binary (binary missing)" during or after a GUI upgrade, this indicates that the GUI application files were not completely updated. Perform a forced CLI upgrade to resolve this issue:
=== Firefox/Waterfox: Blank Page or Hang on Login ===


<syntaxhighlight lang="bash">
'''Firefox/Waterfox: Blank Page or Hang on Login'''
# Log in to the GUI host as root
# Navigate to the GUI installation directory (default is /var/www/html)
cd /var/www/html


# Execute the forced upgrade command
If the Web GUI shows a blank page or hangs during login, but works correctly in Chrome/Edge, the cause is typically a browser extension conflict.
php php/run.php upgrade -f
</syntaxhighlight>


The <code>-f</code> flag forces a complete upgrade, which updates any missing or corrupt GUI binaries.
'''Diagnosis:'''
* Issue occurs in Firefox/Waterfox but not Chrome/Edge
* Works when Developer Tools (F12) is open
* Persists in private mode and through SSH tunnels


=== Blank Screen with JavaScript ReferenceError After Update ===
'''Solution:'''
# In Firefox, navigate to '''about:addons'''
# Select Extensions tab and '''disable all extensions'''
# Close and reopen Firefox completely
# Attempt to log in to the GUI
# If successful, one extension is the cause. Re-enable extensions one by one (or in pairs) restarting Firefox and testing after each change to identify the specific culprit
=== Single User Cannot Access ===


If you can log in to the GUI after an update but are presented with a blank screen, and the browser's JavaScript console shows an error like:
If one user cannot access GUI while others can:


<code>ReferenceError: _AuditActivity_download_wav is not defined</code>
# '''Check IP whitelist''': User Management > edit user > "Access from IPs" field
# '''Check network path''': Compare user's route vs working users
# '''Capture traffic''': <syntaxhighlight lang="bash" inline>tcpdump -i eth0 host USER_IP -w /tmp/debug.pcap</syntaxhighlight>


This is typically caused by a conflicting PEAR file that was not removed during the upgrade. The fix is simple:
=== Blank Screen After Upgrade ===


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Remove the conflicting old PEAR constants file
# Check for conflicting PEAR file
ls -la /usr/share/pear/constants.php
# If exists, remove it:
rm /usr/share/pear/constants.php
rm /usr/share/pear/constants.php


# Refresh your browser (Ctrl+Shift+R) to reload the GUI
# Check SELinux
getenforce
# If Enforcing, temporarily disable: setenforce 0
 
# Clear browser cache
# Press Ctrl+F5 in browser
</syntaxhighlight>
</syntaxhighlight>


After removing this file and refreshing the browser, the GUI should load correctly. This issue occurs because the old <code>constants.php</code> file from the system's PEAR installation conflicts with VoIPmonitor's internal JavaScript definitions.
== No Data Issues ==


== MySQL/MariaDB Database Corruption ==
=== No CDR or Dashboard Data for Current Day ===


If the Web GUI fails to start and logs show MySQL/MariaDB database errors (such as corrupted tables, missing files, or startup failures), this indicates database corruption. This can occur after manual file deletion, disk failures, or improper MySQL shutdown procedures.
'''Step 1: Check sensor status'''


=== Symptoms ===
Navigate to '''Settings > Sensors''' in GUI:
* '''Status UP''' - Sensor connected, proceed to Step 2
* '''Status Down''' - Sensor disconnected, see [[#Sensor Down|Sensor Down]] below


* Web GUI displays database connection errors or shows a blank page
'''Step 2: Generate debug log (if sensor UP)'''
* MySQL/MariaDB service fails to start or immediately crashes
* Error messages in MySQL logs indicating corrupted tables or missing database files
* CDR queries return empty results or throw SQL errors


=== Diagnosis ===
Navigate to '''Tools > Generate Debug Log''' and share the link with VoIPmonitor support.


First, check the MySQL/MariaDB service status:
'''Step 3: Check common causes'''


<syntaxhighlight lang="bash">
{| class="wikitable"
# Check if MySQL/MariaDB is running
! Cause !! Diagnosis !! Solution
systemctl status mysql
|-
# or
| Missing partition || <code>SHOW CREATE TABLE cdr;</code> - check partition for today's date || <code>ALTER TABLE cdr ADD PARTITION (PARTITION pYYYYMMDD VALUES LESS THAN (UNIX_TIMESTAMP('YYYY-MM-DD')));</code>
systemctl status mariadb
|-
| Timezone mismatch || GUI shows different time than DB || Settings > System Configuration > National > Timezone
|-
| CDR disabled || Check voipmonitor.conf || Ensure <code>cdr = yes</code>
|-
| Spool directory || Check <code>spooldir</code> path || Verify path exists and has correct permissions
|}


# View MySQL error logs for corruption indicators
{{Note|If GUI shows yesterday's data but not today's, the most common cause is a missing database partition.}}
tail -100 /var/log/mysql/error.log
# or
tail -100 /var/log/mariadb/mariadb.log
</syntaxhighlight>


Look for error messages such as:
==== Sensor Down ====
* <code>Table is marked as crashed</code>
* <code>InnoDB: Database page corruption</code>
* <code>Incorrect key file</code>
* <code>Can't open file</code>


=== Solution: Restore from PCAP Files (Recommended) ===
<syntaxhighlight lang="bash">
# Check sensor service
systemctl status voipmonitor


If the database is corrupted, a complete restore is necessary. The recommended approach is to '''restore CDR data from the pcap files stored in the spool directory''' into a new, clean database. This preserves your call recordings and metadata while fixing the corruption issue.
# View recent logs
journalctl -u voipmonitor -n 500


'''Warning:''' This procedure requires stopping the VoIPmonitor services and may take significant time depending on the amount of data to restore.
# Check database connectivity
mysql -h DB_HOST -u voipmonitor -p -e "SELECT 1"


The following diagram illustrates the restoration workflow:
# Restart if needed
systemctl restart voipmonitor
</syntaxhighlight>


<kroki lang="plantuml">
=== No Audio Playback ===
@startuml
skinparam shadowing false
skinparam defaultFontName Arial
skinparam activityFontSize 12
skinparam arrowFontSize 11


title Database Restore from PCAP Files
If QoS data is visible but no audio:


start
<syntaxhighlight lang="bash">
# Check voipmonitor.conf
grep -E "^savertp|^savegraph" /etc/voipmonitor.conf


:Stop VoIPmonitor services;
# Should show:
note right: voipmonitor, manager, gui
# savertp = yes
# savegraph = yes (optional)
</syntaxhighlight>


:Backup corrupted database;
See [[Sniffer_configuration#RTP_and_Audio_Recording|RTP and Audio Recording]] for detailed configuration.
note right: /var/lib/mysql-backup-corrupted


:Remove corrupted database;
== Database Issues ==
note right: /var/lib/mysql/voipmonitor


:Start MySQL/MariaDB;
=== GUI Queries Timeout (40-50 seconds) ===


:Create fresh database;
'''MySQL/MariaDB tuning:'''
note right: CREATE DATABASE voipmonitor


:Run sniffer in restore mode;
<syntaxhighlight lang="ini">
note right: --readpcapdir /var/spool/voipmonitor
# /etc/mysql/mysql.conf.d/mysqld.cnf or /etc/my.cnf.d/server.cnf


while (All PCAP files processed?) is (no)
[mysqld]
  :Process next PCAP file;
# Set to 50-70% of available RAM
  :Generate CDR records;
innodb_buffer_pool_size = 4G
endwhile (yes)


:Stop restore process;
# Reduce disk I/O (slight durability tradeoff)
innodb_flush_log_at_trx_commit = 2


:Start normal service;
# Increase connection timeout
note right: systemctl start voipmonitor
wait_timeout = 28800
interactive_timeout = 28800
</syntaxhighlight>


:Verify Web GUI access;
'''Apache mod_fcgid timeout:'''


stop
If you see "server side error - check your http server error log. - connection to the web server was lost / interrupted":


@enduml
<syntaxhighlight lang="apache">
</kroki>
# In httpd.conf or apache2.conf
<IfModule mod_fcgid.c>
    FcgidIdleTimeout 900
    FcgidProcessLifeTime 7200
    FcgidConnectTimeout 300
    FcgidIOTimeout 900
</IfModule>
</syntaxhighlight>


==== Step 1: Stop VoIPmonitor Services ====
<syntaxhighlight lang="bash">
systemctl restart apache2  # or httpd
</syntaxhighlight>


Stop all VoIPmonitor services to prevent further database corruption:
=== Too Many Connections ===


<syntaxhighlight lang="bash">
<syntaxhighlight lang="sql">
# Stop the sniffer service
-- Check current connections
systemctl stop voipmonitor
SHOW STATUS LIKE 'Threads_connected';
SHOW VARIABLES LIKE 'max_connections';


# Stop sniffer manager (if running)
-- Increase limit (temporary)
systemctl stop voipmonitor-manager
SET GLOBAL max_connections = 500;


# Stop any other VoIPmonitor services
-- Permanent: add to my.cnf
systemctl stop voipmonitor-gui
-- max_connections = 500
</syntaxhighlight>
</syntaxhighlight>


==== Step 2: Backup the Corrupted Database ====
=== MySQL Swap Memory Warning ===


Although corrupted, create a backup of the existing database for troubleshooting purposes:
If you see swap memory warning on GUI login:
 
* '''Less than 50 MB swap''' - Safe to ignore, minor performance impact
* '''Hundreds of MB or GB''' - Investigate memory usage, consider increasing RAM or reducing innodb_buffer_pool_size


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Stop MySQL/MariaDB service
# Check MySQL memory usage
systemctl stop mysql
ps aux | grep mysqld
 
free -h
# Create a backup of the MySQL data directory
sudo cp -a /var/lib/mysql /var/lib/mysql-backup-corrupted
</syntaxhighlight>
</syntaxhighlight>


==== Step 3: Remove the Corrupted Database ====
=== Unknown Column in Field List ===


Move or remove the corrupted database files to prepare for a fresh database:
If GUI shows "Unknown column [table].[column] in 'field list'":


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Remove the corrupted VoIPmonitor database directory
# Method 1: URL parameter (fastest)
sudo rm -rf /var/lib/mysql/voipmonitor
# Add ?check_tables=1 to GUI URL:
# http://your-gui-ip/admin.php?check_tables=1


# Alternatively, move it instead of deleting:
# Method 2: Command line
sudo mv /var/lib/mysql/voipmonitor /var/lib/mysql/voipmonitor.corrupted
cd /var/www/html
php php/run.php dbcheck
 
# Method 3: Restart sensor (if disable_dbupgradecheck=no)
systemctl restart voipmonitor
</syntaxhighlight>
</syntaxhighlight>


==== Step 4: Start MySQL/MariaDB Service ====
=== Database Corruption ===


Restart the MySQL/MariaDB service:
'''Recovery methods (try in order):'''


'''Method 1: Table repair'''
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Start MySQL/MariaDB
mysqlcheck -u root -p --auto-repair voipmonitor
systemctl start mysql
</syntaxhighlight>
 
'''Method 2: Drop and recreate specific table'''
<syntaxhighlight lang="sql">
-- Backup structure first
SHOW CREATE TABLE problematic_table;
 
-- Drop and let sensor recreate
DROP TABLE problematic_table;
-- Restart sensor: systemctl restart voipmonitor
</syntaxhighlight>


# Verify the service is running
'''Method 3: InnoDB force recovery'''
systemctl status mysql
<syntaxhighlight lang="ini">
# Add to my.cnf [mysqld] section:
innodb_force_recovery = 1
# Restart MySQL, export data, remove option, reimport
</syntaxhighlight>
</syntaxhighlight>


==== Step 5: Create a Fresh VoIPmonitor Database ====
{{Warning|After using innodb_force_recovery, remove the option before resuming normal operations. The database is read-only while this option is set.}}


Create a new empty database for VoIPmonitor:
'''Method 4: PCAP restore'''


If PCAPs are preserved, drop database and let sensor reindex:
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Log in to MySQL as root
# Edit voipmonitor.conf
mysql -u root -p
reindex_all = yes  # (temporary)
 
systemctl restart voipmonitor
# Wait for reindexing to complete, then remove reindex_all
</syntaxhighlight>
</syntaxhighlight>


Run the following SQL commands:
See [[Database_troubleshooting]] for detailed recovery procedures.


=== MySQL 8.0 Issues ===
'''SYSTEM_USER privilege error:'''
<syntaxhighlight lang="sql">
<syntaxhighlight lang="sql">
CREATE DATABASE voipmonitor;
GRANT SYSTEM_USER ON *.* TO 'voipmonitor'@'localhost';
CREATE USER 'voipmonitor'@'localhost' IDENTIFIED BY 'your_password_here';
GRANT ALL PRIVILEGES ON *.* TO 'voipmonitor'@'localhost' WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON voipmonitor.* TO 'voipmonitor'@'localhost';
FLUSH PRIVILEGES;
FLUSH PRIVILEGES;
EXIT;
 
-- Also set:
SET GLOBAL log_bin_trust_function_creators = 1;
</syntaxhighlight>
</syntaxhighlight>


Replace <code>your_password_here</code> with a strong password.
'''MySQL 8.0.42 crashes:'''


==== Step 6: Restore CDRs from PCAP Files ====
{{Warning|MySQL 8.0.42 has known bugs causing VoIPmonitor crashes. Upgrade to 8.0.43 or later.}}


Instruct the sniffer to reprocess all PCAP files from the spool directory and populate the new database:
<syntaxhighlight lang="bash">
mysql --version
# If 8.0.42:
sudo apt install --only-upgrade mysql-server-8.0  # Debian/Ubuntu
sudo dnf update mysql-server                      # RHEL
</syntaxhighlight>


<syntaxhighlight lang="bash">
=== Managed Database: Primary Key Error ===
# 1. Verify your spool directory path
# Check voipmonitor.conf for the spooldir setting (default: /var/spool/voipmonitor)
grep "^spooldir" /etc/voipmonitor.conf


# 2. Clear the sniffer's manager socket for the restore process
For DigitalOcean, AWS RDS, Google Cloud SQL:
# This ensures clean communication with the sniffer
rm -f /tmp/vmsck


# 3. Start the sniffer in restore mode
<syntaxhighlight lang="sql">
# The sniffer will read all PCAP files from the spool directory
-- Disable in managed DB console or parameter group:
# and regenerate CDR records in the new database
sql_require_primary_key = OFF
voipmonitor --config-file /etc/voipmonitor.conf --readpcapdir /var/spool/voipmonitor
</syntaxhighlight>
</syntaxhighlight>


'''Note:''' The <code>--readpcapdir</code> parameter instructs the sniffer to process all PCAP files in the specified directory. This may take considerable time depending on the amount of historical data.
== GUI Upgrade Issues ==


==== Step 7: Monitor the Restore Process ====
=== Cannot Login After Upgrade ===


Monitor the restore progress:
'''Reset password via database:'''
<syntaxhighlight lang="sql">
UPDATE users SET password = MD5('newpassword') WHERE username = 'admin';
</syntaxhighlight>


'''Redis session issue (login loop):'''
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Monitor sniffer output for progress
redis-cli FLUSHALL
journalctl -u voipmonitor -f
systemctl restart php-fpm
 
# Alternatively, check the database for new CDR records
mysql -u root -p voipmonitor -e "SELECT COUNT(*) FROM cdr;"
</syntaxhighlight>
</syntaxhighlight>


==== Step 8: Restart Normal Service ====
=== VM Binary Error ===
 
Once the restore is complete, restart the sniffer in normal operation mode:


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Stop the restore process (Ctrl+C if running manually)
cd /var/www/html
# Then start the normal sniffer service
php php/run.php upgrade -f
systemctl start voipmonitor
</syntaxhighlight>


# Verify the sniffer is running and capturing
=== Invalid Compressed Data ===
systemctl status voipmonitor


# Test Web GUI access
Usually caused by incorrect web root ownership:
# Navigate to http://your-server/ in your browser
<syntaxhighlight lang="bash">
chown -R www-data:www-data /var/www/html  # Debian/Ubuntu
chown -R apache:apache /var/www/html      # RHEL/CentOS
</syntaxhighlight>
</syntaxhighlight>


=== Prevention: Database Backup Strategies ===
=== Unable to Remove Old Files ===


To avoid future data loss due to database corruption:
<syntaxhighlight lang="bash">
# Fix tshark ownership
chown www-data:www-data /var/www/html/bin/tshark*


==== Automatic Filesystem Backup ====
# Retry upgrade from GUI
</syntaxhighlight>


Configure regular backups of the MySQL data directory:
=== Upgrade Not Visible ===


Check internet connectivity from GUI server:
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Example: Daily backup using cron
curl -I https://www.voipmonitor.org
0 2 * * * /usr/bin/rsync -av --delete /var/lib/mysql/ /backup/mysql-$(date +\%Y\%m\%d)/
ping www.voipmonitor.org
</syntaxhighlight>
</syntaxhighlight>


==== MySQL Replication ====
== Permission Issues ==


Set up MySQL master-slave replication for redundancy:
=== Incorrect Ownership Error ===
* See the [[Mysql_master-slave_replication_hints]] guide for detailed instructions
* This provides a real-time backup database that can be promoted if corruption occurs


==== VoIPmonitor Database Replication ====
Often caused by missing execute permissions on binaries:
<syntaxhighlight lang="bash">
# Fix bin directory
chmod +x /var/www/html/bin/*


Use VoIPmonitor's built-in database backup mode ([[Redundant_database]]):
# Verify
* This replicates CDR data to a secondary database server
ls -la /var/www/html/bin/
* No traditional MySQL replication required
</syntaxhighlight>
* Useful for GUI migrations and disaster recovery


== IonCube Loader Issues ==
=== NAS Spool Permission Denied ===


The VoIPmonitor GUI is protected with IonCube, which requires proper PHP configuration. Common issues include permission errors on temporary directories and security module interference.
<syntaxhighlight lang="bash">
# Use ACLs (recommended)
setfacl -R -m u:www-data:rwx /path/to/nas/spool


=== Unable to create lock file / temp directory not writable ===
# CRITICAL: Set on ALL parent directories too
setfacl -m u:www-data:rx /NAS
setfacl -m u:www-data:rx /NAS/voipmonitor


If you see errors like "Unable to create lock file" or "System temp directory check fails... not writable" from IonCube Loader, follow these troubleshooting steps:
# Verify
sudo -u www-data ls /path/to/nas/spool
</syntaxhighlight>


==== Step 1: Update the system and restart ====
=== SELinux Blocking mscgen (SIP Call Flow Diagrams) ===


First, ensure your system packages are up to date:
If SIP call flow diagram shows "convert msc to svg (mscgen): unknown error":


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Debian/Ubuntu
# Check SELinux denials
sudo apt update && sudo apt upgrade -y
ausearch -m avc -ts recent | grep mscgen


# RHEL/CentOS/AlmaLinux
# Create policy module
sudo yum update -y
grep mscgen /var/log/audit/audit.log | audit2allow -M mscgen_local
# or
semodule -i mscgen_local.pp
sudo dnf update -y
 
# Then restart the server
sudo reboot
</syntaxhighlight>
</syntaxhighlight>


==== Step 2: Check SELinux or AppArmor ====
== IonCube and PHP Issues ==


Security modules like SELinux (default on RHEL/CentOS/Red Hat systems) or AppArmor (default on Ubuntu/Debian) can block IonCube from accessing temporary directories.
=== Temp Directory Not Writable ===


'''Check if SELinux is enabled:'''
<syntaxhighlight lang="bash">
# Check and fix /tmp permissions
ls -ld /tmp
chmod 1777 /tmp


<syntaxhighlight lang="bash">
# Check SELinux
# Check current status
getenforce
getenforce
# If Enforcing, try: setenforce 0


# Common values: Enforcing (active), Permissive (logging only), Disabled
# Check systemd PrivateTmp
 
systemctl show httpd | grep PrivateTmp
# To temporarily disable SELinux for testing:
# If true, create override:
sudo setenforce 0
# /etc/systemd/system/httpd.service.d/privatetmp.conf
# [Service]
# PrivateTmp=false
</syntaxhighlight>
</syntaxhighlight>


If disabling SELinux resolves the issue, you can permanently configure it:
=== PHP CLI vs Web Server Mismatch ===


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Edit the SELinux configuration file
# Test as web server user
sudo nano /etc/selinux/config
sudo -u www-data php -r 'echo extension_loaded("ionCube Loader")?"yes":"no";'
 
# Compare configs
php --ini                    # CLI config
# Create phpinfo: echo '<?php phpinfo();' > /var/www/html/info.php
# Check "Loaded Configuration File" in browser
# Remove after: rm /var/www/html/info.php
</syntaxhighlight>


# Change SELINUX= to either:
=== License Activation: Server Side Error - Forbidden ===
# SELINUX=permissive
# or
# SELINUX=disabled


# Then reboot the server
This indicates ionCube PHP version incompatibility:
sudo reboot
</syntaxhighlight>


'''Check if AppArmor is enabled:'''
{| class="wikitable"
! GUI Version !! PHP Version
|-
| v26.37+ || PHP 8.3 supported
|-
| Older || PHP 8.2 or earlier required
|}


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Check AppArmor status
# Check Apache error log
sudo aa-status
tail -50 /var/log/apache2/error.log | grep -i ioncube
 
# If AppArmor is running, temporarily disable individual profiles:
sudo aa-disable /etc/apparmor.d/*php*


# Or disable it entirely for testing:
# Solution: Either upgrade GUI to v26.37+ or downgrade PHP to 8.2
sudo systemctl stop apparmor
sudo systemctl disable apparmor
</syntaxhighlight>
</syntaxhighlight>


==== Step 3: Check systemd PrivateTmp ====
== Other Issues ==


Some systemd service configurations use <code>PrivateTmp=true</code>, which creates a private temporary directory for each service. This can cause issues if the private tmp directory has restrictive permissions.
=== Invalid Timezone (GUI Inaccessible) ===


Check if your web server is using PrivateTmp:
<syntaxhighlight lang="bash">
# Edit directly
nano /var/www/html/config/configuration.php


<syntaxhighlight lang="bash">
# Find and fix:
# For Apache
define('TIMEZONE', 'UTC');  # Use valid timezone
systemctl show httpd | grep PrivateTmp
define('SENSORS_TIMEZONE', 'UTC');
# or
systemctl show apache2 | grep PrivateTmp


# For PHP-FPM
systemctl restart php-fpm
systemctl show php-fpm | grep PrivateTmp
</syntaxhighlight>
</syntaxhighlight>


If PrivateTmp is enabled (value=1), disable it in the service file:
Valid timezones: <code>UTC</code>, <code>Europe/London</code>, <code>America/New_York</code>, <code>Europe/Berlin</code>, etc.
 
=== Faxes Not Displayed ===


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Create override directory if it doesn't exist
# Install libtiff-tools
sudo mkdir -p /etc/systemd/system/httpd.service.d
apt-get install libtiff-tools    # Debian/Ubuntu
yum install libtiff-tools        # RHEL/CentOS


# Create override file
# Verify
sudo nano /etc/systemd/system/httpd.service.d/privatetmp.conf
which tiff2pdf
</syntaxhighlight>
</syntaxhighlight>


Add the following content:
=== File Attachment Blocked ===


<syntaxhighlight lang="ini">
Files like .xlsx, .docx are blocked for security. Compress to .zip or .gz:
[Service]
<syntaxhighlight lang="bash">
PrivateTmp=false
zip archive.zip your_file.xlsx
</syntaxhighlight>
</syntaxhighlight>


Then reload and restart:
=== RRD Graph Errors After Hardware Change ===


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Reload systemd and restart the service
# Delete corrupted RRD files
sudo systemctl daemon-reload
rm -rf /var/spool/voipmonitor/rrd/*
sudo systemctl restart httpd
# or
sudo systemctl restart apache2
</syntaxhighlight>
 
==== Step 4: Verify PHP Temporary Directory Configuration ====
 
Check which temporary directory PHP is using:


Create a PHP info file:
# Sensor will recreate them
 
systemctl restart voipmonitor
<syntaxhighlight lang="bash">
echo '<?php phpinfo(); ?>' > /var/www/html/info.php
</syntaxhighlight>
</syntaxhighlight>


Visit <code>http://your-server-ip/info.php</code> in your browser and search for:
=== /dev/shm Full (Session Logout Issues) ===
* <code>upload_tmp_dir</code>
* <code>sys_get_temp_dir</code>
* <code>session.save_path</code>
 
Ensure these directories are writable by the web server user:


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Check ownership
# Check usage
ls -ld /tmp
df -h /dev/shm


# Fix ownership if needed
# Temporary increase
sudo chown www-data:www-data /tmp  # Debian/Ubuntu
mount -o remount,size=1G /dev/shm
# or
sudo chown apache:apache /tmp      # CentOS/RHEL


# Fix permissions
# Permanent: edit /etc/fstab
sudo chmod 1777 /tmp
# tmpfs /dev/shm tmpfs defaults,size=1G 0 0
</syntaxhighlight>
</syntaxhighlight>


'''Important:''' Clean up after troubleshooting:
=== Concurrent Calls Stats Error ===


Usually caused by duplicate cron entries:
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
rm /var/www/html/info.php
# Check for duplicates
grep "voipmonitor\|run.php" /etc/crontab
 
# Comment out duplicates, keep only one
</syntaxhighlight>
</syntaxhighlight>


==== Step 5: Check open_basedir restrictions ====
=== TShark CVE Security Updates ===


If the above steps don't resolve the issue, check if PHP's <code>open_basedir</code> is restricting access to the temp directory:
The bundled tshark may have known CVEs. To update:


<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
# Check open_basedir in php.ini
cd /var/www/html/bin
grep open_basedir /etc/php/*/apache2/php.ini
 
# or
# Download updated binary from Wireshark
grep open_basedir /etc/php.ini
wget https://www.wireshark.org/download/automated/linux64/tshark
chmod +x tshark
chown www-data:www-data tshark
</syntaxhighlight>
</syntaxhighlight>


Ensure the temp directory is included in the list, e.g.:
=== Dashboard Edit Icon Grayed Out ===


<code>open_basedir = /var/www/html:/tmp:/var/tmp</code>
User lacks edit permission. Grant via '''User Management''' > edit user > enable "Edit Dashboard" permission.


== Alternative: MySQL General Log ==
== GUI Not Loading (Spool Directory Ownership) ==


If you need a persistent server-side log of all database queries (not just from the GUI), you can enable the MySQL general log:
If the GUI is not loading or shows generic error messages, the cause may be incorrect ownership of the spool directory by the web server user.


<syntaxhighlight lang="sql">
<syntaxhighlight lang="bash">
-- Enable general log
# Fix spool directory ownership
SET GLOBAL general_log = 'ON';
chown -R www-data:www-data /var/spool/voipmonitor    # Debian/Ubuntu
# OR
chown -R apache:apache /var/spool/voipmonitor        # RHEL/CentOS
</syntaxhighlight>


-- Perform actions in the GUI...
{{Note|The spool directory path is defined by the <code>spooldir</code> parameter in <code>/etc/voipmonitor.conf</code>. Use the correct path for your configuration.}}


-- Disable when done (important for performance)
SET GLOBAL general_log = 'OFF';
</syntaxhighlight>


The log file location is typically <code>/var/lib/mysql/hostname.log</code> or as defined in your MySQL configuration.


'''Warning:''' The general log can grow very quickly on a busy system. Always disable it after debugging.


== AI Summary for RAG ==
== AI Summary for RAG ==


'''Summary:''' This page covers GUI troubleshooting techniques including debug mode activation, MySQL/MariaDB database corruption restoration from PCAP files, upgrade issues (blank screen with JavaScript errors, conflicting constants.php file), and IonCube Loader problems with temp directory permissions, SELinux, AppArmor, and systemd PrivateTmp.
'''Summary:''' VoIPmonitor GUI troubleshooting guide covering: (1) HTTP 500 errors - try client-side steps first (different browser, incognito, clear cache), then check Apache/PHP error logs and SELinux; (2) No CDR for current day - check sensor status in Settings > Sensors, generate debug log if UP, check partitions/timezone/cdr config if Down; (3) GUI debug mode - add ?debug=31415 to URL; (4) Database timeouts - tune innodb_buffer_pool_size (50-70% RAM), increase mod_fcgid timeouts; (5) Database corruption - use mysqlcheck, drop/recreate tables, or innodb_force_recovery; (6) GUI upgrade issues - reset password via database, fix ownership, run php php/run.php upgrade -f; (7) Permission errors - chmod +x bin/*, use setfacl for NAS; (8) IonCube errors - check SELinux, PHP version compatibility (GUI v26.37+ for PHP 8.3); (9) Schema errors - use ?check_tables=1 URL parameter.


'''Keywords:''' GUI troubleshooting, debug mode, MySQL corruption, MariaDB corruption, database restore, PCAP restore, CDR restore, IonCube, SELinux, AppArmor, PrivateTmp, temporary directory, permissions, open_basedir, upgrade issues, blank screen, JavaScript errors, constants.php, PEAR, ReferenceError
'''Keywords:''' HTTP 500, no CDR, sensor status, debug mode, ?debug=31415, innodb_buffer_pool_size, MySQL tuning, database corruption, mysqlcheck, innodb_force_recovery, GUI upgrade, password reset, IonCube, SELinux, PHP 8.3, ?check_tables=1, NAS permissions, setfacl, mod_fcgid timeout, FcgidIOTimeout, mscgen, SIP call flow, tshark CVE, MySQL 8.0.42, SYSTEM_USER privilege, /dev/shm, timezone error, libtiff-tools, file attachment blocked


'''Key Questions:'''
'''Key Questions:'''
* How do I enable debug mode in the GUI to see SQL queries?
* HTTP 500 error on GUI - what to try first?
* What should I do if the MySQL/MariaDB database is corrupted?
* No CDR or dashboard data for current day - how to diagnose?
* How do I restore CDR data from PCAP files after database corruption?
* How to enable GUI debug mode?
* How do I fix "Unable to create lock file" errors from IonCube Loader?
* GUI queries timeout - how to tune MySQL?
* How do I check if SELinux or AppArmor is blocking the GUI?
* Database corrupted - which recovery method to use?
* What is systemd PrivateTmp and how does it affect the GUI?
* Cannot login after GUI upgrade - how to reset password?
* Why is my GUI showing a blank screen with JavaScript ReferenceError after an update?
* Permission errors with NAS spool - how to fix?
* How do I fix ReferenceError: _AuditActivity_download_wav is not defined?
* IonCube temp directory errors - what causes them?
* GUI shows "Unknown column in field list" - how to fix?
* SIP call flow diagram shows error - how to fix SELinux blocking?
* MySQL 8.0.42 causing crashes - what to do?
* License activation fails with Forbidden error - what causes it?

Latest revision as of 01:37, 10 January 2026

GUI Troubleshooting

This guide covers common VoIPmonitor GUI issues organized by symptom category.

Quick Navigation

Category Common Issues
Access Issues HTTP 500, blank screen, single user cannot access
No Data Issues No CDR for today, empty dashboard, missing calls
Database Issues Timeouts, corruption, connections, schema errors
GUI Upgrade Issues Cannot login, blank screen, VM Binary error
Permission Issues Ownership errors, NAS access, binary execution
IonCube/PHP Issues Loader errors, temp directory, PHP version
Other Issues Timezone, fax, attachments, RRD graphs

Access Issues

HTTP 500 Error

Client-side steps (try first):

  1. Different browser or incognito mode
  2. Clear browser cache (Ctrl+Shift+Delete)
  3. Disable browser extensions
  4. Try from a different network

Server-side diagnosis: 

# Check Apache error log
tail -100 /var/log/apache2/error.log    # Debian/Ubuntu
tail -100 /var/log/httpd/error_log      # RHEL/CentOS

# Check PHP-FPM log
tail -100 /var/log/php-fpm/www-error.log

# Check SELinux
getenforce
# If "Enforcing", try temporarily: setenforce 0

💡 Tip:


Firefox/Waterfox: Blank Page or Hang on Login

Firefox/Waterfox: Blank Page or Hang on Login

If the Web GUI shows a blank page or hangs during login, but works correctly in Chrome/Edge, the cause is typically a browser extension conflict.

Diagnosis:

  • Issue occurs in Firefox/Waterfox but not Chrome/Edge
  • Works when Developer Tools (F12) is open
  • Persists in private mode and through SSH tunnels

Solution:

  1. In Firefox, navigate to about:addons
  2. Select Extensions tab and disable all extensions
  3. Close and reopen Firefox completely
  4. Attempt to log in to the GUI
  5. If successful, one extension is the cause. Re-enable extensions one by one (or in pairs) restarting Firefox and testing after each change to identify the specific culprit

Single User Cannot Access

If one user cannot access GUI while others can:

  1. Check IP whitelist: User Management > edit user > "Access from IPs" field
  2. Check network path: Compare user's route vs working users
  3. Capture traffic: tcpdump -i eth0 host USER_IP -w /tmp/debug.pcap

Blank Screen After Upgrade

# Check for conflicting PEAR file
ls -la /usr/share/pear/constants.php
# If exists, remove it:
rm /usr/share/pear/constants.php

# Check SELinux
getenforce
# If Enforcing, temporarily disable: setenforce 0

# Clear browser cache
# Press Ctrl+F5 in browser

No Data Issues

No CDR or Dashboard Data for Current Day

Step 1: Check sensor status

Navigate to Settings > Sensors in GUI:

  • Status UP - Sensor connected, proceed to Step 2
  • Status Down - Sensor disconnected, see Sensor Down below

Step 2: Generate debug log (if sensor UP)

Navigate to Tools > Generate Debug Log and share the link with VoIPmonitor support.

Step 3: Check common causes

Cause Diagnosis Solution
Missing partition SHOW CREATE TABLE cdr; - check partition for today's date ALTER TABLE cdr ADD PARTITION (PARTITION pYYYYMMDD VALUES LESS THAN (UNIX_TIMESTAMP('YYYY-MM-DD')));
Timezone mismatch GUI shows different time than DB Settings > System Configuration > National > Timezone
CDR disabled Check voipmonitor.conf Ensure cdr = yes
Spool directory Check spooldir path Verify path exists and has correct permissions

ℹ️ Note: If GUI shows yesterday's data but not today's, the most common cause is a missing database partition.

Sensor Down

# Check sensor service
systemctl status voipmonitor

# View recent logs
journalctl -u voipmonitor -n 500

# Check database connectivity
mysql -h DB_HOST -u voipmonitor -p -e "SELECT 1"

# Restart if needed
systemctl restart voipmonitor

No Audio Playback

If QoS data is visible but no audio: 

# Check voipmonitor.conf
grep -E "^savertp|^savegraph" /etc/voipmonitor.conf

# Should show:
# savertp = yes
# savegraph = yes (optional)

See RTP and Audio Recording for detailed configuration.

Database Issues

GUI Queries Timeout (40-50 seconds)

MySQL/MariaDB tuning: 

# /etc/mysql/mysql.conf.d/mysqld.cnf or /etc/my.cnf.d/server.cnf

[mysqld]
# Set to 50-70% of available RAM
innodb_buffer_pool_size = 4G

# Reduce disk I/O (slight durability tradeoff)
innodb_flush_log_at_trx_commit = 2

# Increase connection timeout
wait_timeout = 28800
interactive_timeout = 28800

Apache mod_fcgid timeout:

If you see "server side error - check your http server error log. - connection to the web server was lost / interrupted": 

# In httpd.conf or apache2.conf
<IfModule mod_fcgid.c>
    FcgidIdleTimeout 900
    FcgidProcessLifeTime 7200
    FcgidConnectTimeout 300
    FcgidIOTimeout 900
</IfModule>

systemctl restart apache2  # or httpd

Too Many Connections

-- Check current connections
SHOW STATUS LIKE 'Threads_connected';
SHOW VARIABLES LIKE 'max_connections';

-- Increase limit (temporary)
SET GLOBAL max_connections = 500;

-- Permanent: add to my.cnf
-- max_connections = 500

MySQL Swap Memory Warning

If you see swap memory warning on GUI login:

  • Less than 50 MB swap - Safe to ignore, minor performance impact
  • Hundreds of MB or GB - Investigate memory usage, consider increasing RAM or reducing innodb_buffer_pool_size
# Check MySQL memory usage
ps aux | grep mysqld
free -h

Unknown Column in Field List

If GUI shows "Unknown column [table].[column] in 'field list'": 

# Method 1: URL parameter (fastest)
# Add ?check_tables=1 to GUI URL:
# http://your-gui-ip/admin.php?check_tables=1

# Method 2: Command line
cd /var/www/html
php php/run.php dbcheck

# Method 3: Restart sensor (if disable_dbupgradecheck=no)
systemctl restart voipmonitor

Database Corruption

Recovery methods (try in order):

Method 1: Table repair 

mysqlcheck -u root -p --auto-repair voipmonitor

Method 2: Drop and recreate specific table 

-- Backup structure first
SHOW CREATE TABLE problematic_table;

-- Drop and let sensor recreate
DROP TABLE problematic_table;
-- Restart sensor: systemctl restart voipmonitor

Method 3: InnoDB force recovery 

# Add to my.cnf [mysqld] section:
innodb_force_recovery = 1
# Restart MySQL, export data, remove option, reimport

⚠️ Warning: After using innodb_force_recovery, remove the option before resuming normal operations. The database is read-only while this option is set.

Method 4: PCAP restore

If PCAPs are preserved, drop database and let sensor reindex: 

# Edit voipmonitor.conf
reindex_all = yes  # (temporary)

systemctl restart voipmonitor
# Wait for reindexing to complete, then remove reindex_all

See Database_troubleshooting for detailed recovery procedures.

MySQL 8.0 Issues

SYSTEM_USER privilege error: 

GRANT SYSTEM_USER ON *.* TO 'voipmonitor'@'localhost';
GRANT ALL PRIVILEGES ON *.* TO 'voipmonitor'@'localhost' WITH GRANT OPTION;
FLUSH PRIVILEGES;

-- Also set:
SET GLOBAL log_bin_trust_function_creators = 1;

MySQL 8.0.42 crashes:

⚠️ Warning: MySQL 8.0.42 has known bugs causing VoIPmonitor crashes. Upgrade to 8.0.43 or later. 

mysql --version
# If 8.0.42:
sudo apt install --only-upgrade mysql-server-8.0  # Debian/Ubuntu
sudo dnf update mysql-server                       # RHEL

Managed Database: Primary Key Error

For DigitalOcean, AWS RDS, Google Cloud SQL: 

-- Disable in managed DB console or parameter group:
sql_require_primary_key = OFF

GUI Upgrade Issues

Cannot Login After Upgrade

Reset password via database: 

UPDATE users SET password = MD5('newpassword') WHERE username = 'admin';

Redis session issue (login loop): 

redis-cli FLUSHALL
systemctl restart php-fpm

VM Binary Error

cd /var/www/html
php php/run.php upgrade -f

Invalid Compressed Data

Usually caused by incorrect web root ownership: 

chown -R www-data:www-data /var/www/html  # Debian/Ubuntu
chown -R apache:apache /var/www/html       # RHEL/CentOS

Unable to Remove Old Files

# Fix tshark ownership
chown www-data:www-data /var/www/html/bin/tshark*

# Retry upgrade from GUI

Upgrade Not Visible

Check internet connectivity from GUI server: 

curl -I https://www.voipmonitor.org
ping www.voipmonitor.org

Permission Issues

Incorrect Ownership Error

Often caused by missing execute permissions on binaries: 

# Fix bin directory
chmod +x /var/www/html/bin/*

# Verify
ls -la /var/www/html/bin/

NAS Spool Permission Denied

# Use ACLs (recommended)
setfacl -R -m u:www-data:rwx /path/to/nas/spool

# CRITICAL: Set on ALL parent directories too
setfacl -m u:www-data:rx /NAS
setfacl -m u:www-data:rx /NAS/voipmonitor

# Verify
sudo -u www-data ls /path/to/nas/spool

SELinux Blocking mscgen (SIP Call Flow Diagrams)

If SIP call flow diagram shows "convert msc to svg (mscgen): unknown error": 

# Check SELinux denials
ausearch -m avc -ts recent | grep mscgen

# Create policy module
grep mscgen /var/log/audit/audit.log | audit2allow -M mscgen_local
semodule -i mscgen_local.pp

IonCube and PHP Issues

Temp Directory Not Writable

# Check and fix /tmp permissions
ls -ld /tmp
chmod 1777 /tmp

# Check SELinux
getenforce
# If Enforcing, try: setenforce 0

# Check systemd PrivateTmp
systemctl show httpd | grep PrivateTmp
# If true, create override:
# /etc/systemd/system/httpd.service.d/privatetmp.conf
# [Service]
# PrivateTmp=false

PHP CLI vs Web Server Mismatch

# Test as web server user
sudo -u www-data php -r 'echo extension_loaded("ionCube Loader")?"yes":"no";'

# Compare configs
php --ini                    # CLI config
# Create phpinfo: echo '<?php phpinfo();' > /var/www/html/info.php
# Check "Loaded Configuration File" in browser
# Remove after: rm /var/www/html/info.php

License Activation: Server Side Error - Forbidden

This indicates ionCube PHP version incompatibility:

GUI Version PHP Version
v26.37+ PHP 8.3 supported
Older PHP 8.2 or earlier required 
# Check Apache error log
tail -50 /var/log/apache2/error.log | grep -i ioncube

# Solution: Either upgrade GUI to v26.37+ or downgrade PHP to 8.2

Other Issues

Invalid Timezone (GUI Inaccessible)

# Edit directly
nano /var/www/html/config/configuration.php

# Find and fix:
define('TIMEZONE', 'UTC');  # Use valid timezone
define('SENSORS_TIMEZONE', 'UTC');

systemctl restart php-fpm

Valid timezones: UTC, Europe/London, America/New_York, Europe/Berlin, etc.

Faxes Not Displayed

# Install libtiff-tools
apt-get install libtiff-tools    # Debian/Ubuntu
yum install libtiff-tools        # RHEL/CentOS

# Verify
which tiff2pdf

File Attachment Blocked

Files like .xlsx, .docx are blocked for security. Compress to .zip or .gz: 

zip archive.zip your_file.xlsx

RRD Graph Errors After Hardware Change

# Delete corrupted RRD files
rm -rf /var/spool/voipmonitor/rrd/*

# Sensor will recreate them
systemctl restart voipmonitor

/dev/shm Full (Session Logout Issues)

# Check usage
df -h /dev/shm

# Temporary increase
mount -o remount,size=1G /dev/shm

# Permanent: edit /etc/fstab
# tmpfs /dev/shm tmpfs defaults,size=1G 0 0

Concurrent Calls Stats Error

Usually caused by duplicate cron entries: 

# Check for duplicates
grep "voipmonitor\|run.php" /etc/crontab

# Comment out duplicates, keep only one

TShark CVE Security Updates

The bundled tshark may have known CVEs. To update: 

cd /var/www/html/bin

# Download updated binary from Wireshark
wget https://www.wireshark.org/download/automated/linux64/tshark
chmod +x tshark
chown www-data:www-data tshark

Dashboard Edit Icon Grayed Out

User lacks edit permission. Grant via User Management > edit user > enable "Edit Dashboard" permission.

GUI Not Loading (Spool Directory Ownership)

If the GUI is not loading or shows generic error messages, the cause may be incorrect ownership of the spool directory by the web server user. 

# Fix spool directory ownership
chown -R www-data:www-data /var/spool/voipmonitor    # Debian/Ubuntu
# OR
chown -R apache:apache /var/spool/voipmonitor        # RHEL/CentOS

ℹ️ Note: The spool directory path is defined by the spooldir parameter in /etc/voipmonitor.conf. Use the correct path for your configuration.



AI Summary for RAG

Summary: VoIPmonitor GUI troubleshooting guide covering: (1) HTTP 500 errors - try client-side steps first (different browser, incognito, clear cache), then check Apache/PHP error logs and SELinux; (2) No CDR for current day - check sensor status in Settings > Sensors, generate debug log if UP, check partitions/timezone/cdr config if Down; (3) GUI debug mode - add ?debug=31415 to URL; (4) Database timeouts - tune innodb_buffer_pool_size (50-70% RAM), increase mod_fcgid timeouts; (5) Database corruption - use mysqlcheck, drop/recreate tables, or innodb_force_recovery; (6) GUI upgrade issues - reset password via database, fix ownership, run php php/run.php upgrade -f; (7) Permission errors - chmod +x bin/*, use setfacl for NAS; (8) IonCube errors - check SELinux, PHP version compatibility (GUI v26.37+ for PHP 8.3); (9) Schema errors - use ?check_tables=1 URL parameter.

Keywords: HTTP 500, no CDR, sensor status, debug mode, ?debug=31415, innodb_buffer_pool_size, MySQL tuning, database corruption, mysqlcheck, innodb_force_recovery, GUI upgrade, password reset, IonCube, SELinux, PHP 8.3, ?check_tables=1, NAS permissions, setfacl, mod_fcgid timeout, FcgidIOTimeout, mscgen, SIP call flow, tshark CVE, MySQL 8.0.42, SYSTEM_USER privilege, /dev/shm, timezone error, libtiff-tools, file attachment blocked

Key Questions:

  • HTTP 500 error on GUI - what to try first?
  • No CDR or dashboard data for current day - how to diagnose?
  • How to enable GUI debug mode?
  • GUI queries timeout - how to tune MySQL?
  • Database corrupted - which recovery method to use?
  • Cannot login after GUI upgrade - how to reset password?
  • Permission errors with NAS spool - how to fix?
  • IonCube temp directory errors - what causes them?
  • GUI shows "Unknown column in field list" - how to fix?
  • SIP call flow diagram shows error - how to fix SELinux blocking?
  • MySQL 8.0.42 causing crashes - what to do?
  • License activation fails with Forbidden error - what causes it?
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