Articles Tagged: #troubleshooting
Showing 13 verified technical articles tagged with #troubleshooting.
How to Troubleshoot cPanel Email Queue and Delayed Emails
A step-by-step diagnostic guide for web hosts and sysadmins to resolve Exim mail queue backlogs, find outbound spam scripts, and fix delayed email delivery in cPanel/WHM.
How to Troubleshoot AWS EC2 Disk Space and EBS Volume Issues
A production guide to resolve disk full errors on AWS EC2 instances, expand EBS volumes online without downtime, extend partitions using growpart, and resize ext4/XFS filesystems.
How to Fix “MySQL Server Has Gone Away” (Error 2006)
A complete troubleshooting guide to resolve MySQL/MariaDB Error 2006 (CR_SERVER_GONE_ERROR). Increase max_allowed_packet, configure wait_timeout, and fix database crashes.
How to Fix “Too Many Connections” (Error 1040) in MySQL and MariaDB
A production guide to resolve MySQL/MariaDB Error 1040: Too Many Connections. Gain emergency root access, terminate sleeping threads, tune max_connections, and adjust wait_timeout.
How to Fix 'ssh: connect to host port 22: Connection refused' on Linux
Diagnose and resolve SSH port 22 connection refused errors caused by stopped sshd daemons, local firewalls, custom port mismatches, or Fail2ban IP blocks.
How to Troubleshoot High CPU Usage on a Linux Server
A step-by-step diagnostic guide to isolate runaway processes, high system load, and thread contention on production Linux servers using top, pidstat, and mpstat.
How to Troubleshoot High Load and CPU Spikes on a Production Linux Server
A methodical diagnosis guide to isolate runaway PHP-FPM workers, MySQL lockups, unindexed queries, and stuck cron jobs using top, htop, and iotop.
How to Fix “No Space Left on Device” on a Linux Server
A comprehensive troubleshooting guide to resolve Linux disk full errors, find large directories, identify inode exhaustion, and release deleted files held open by active processes.
How to Fix “DNS_PROBE_FINISHED_NXDOMAIN” on Web Hosting Domains
A complete diagnostic guide to resolve DNS_PROBE_FINISHED_NXDOMAIN errors. Verify domain A records, check WHOIS clientHold status, fix nameserver mismatches, and trace global DNS propagation.
How to Fix a Docker Container That Keeps Restarting
A production diagnostic guide to fix Docker containers stuck in restart loops. Diagnose exit codes (1, 137 OOM, 139), inspect crash logs, and debug ENTRYPOINT issues.
How to Diagnose and Resolve 502 Bad Gateway Errors in Nginx and PHP-FPM
Identify upstream socket buffer overflows, fastcgi_read_timeout limits, crashed daemon workers, and SELinux permission blocks.
How to Fix “504 Gateway Timeout” Error in Nginx and Web Servers
A production guide to diagnose and fix HTTP 504 Gateway Timeout errors in Nginx, PHP-FPM, and Apache. Tune fastcgi_read_timeout, fix worker pool exhaustion, and trace slow upstream queries.
How to Fix “Error Establishing a Database Connection” in WordPress
A complete step-by-step troubleshooting guide to diagnose and fix WordPress database connection errors. Verify wp-config.php credentials, repair corrupted MySQL tables, and restart crashed MariaDB daemons.
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