Guides tagged “troubleshooting”

Step-by-step MdmHost guides about troubleshooting, sorted A-Z.

178 guides · page 4 of 9

  • Fix 502 Bad Gateway errors with Nginx and PHP-FPM

    Diagnose 502 Bad Gateway on PHP sites: PHP-FPM down or crashing, wrong socket path or permissions, exhausted workers, oversized headers and upstream timeouts.

    IntermediateLinux VPS3 min read

  • Fix 502 Bad Gateway in Nginx

    A 502 Bad Gateway means Nginx could not get a valid answer from PHP-FPM or your app. Read the error log, then check the backend service, socket path, permissions and ports.

    IntermediateLinux server5 min read

  • Fix 503 errors for Node.js apps in cPanel (Setup Node.js App)

    Diagnose 503 Service Unavailable and startup failures for apps created in cPanel's Setup Node.js App: startup file, dependencies, ports, logs and CloudLinux resource limits.

    IntermediatecPanel hosting3 min read

  • Fix 504 Gateway Timeout errors on Nginx, PHP and app servers

    Find why a request times out with 504 Gateway Timeout: slow PHP or database queries, mismatched proxy and FPM timeouts, CDN limits, and when to raise timeouts versus fix the code.

    IntermediateLinux VPS3 min read

  • Fix a 500 Internal Server Error in WordPress

    Troubleshoot a WordPress 500 Internal Server Error on cPanel: check error logs, reset .htaccess, fix PHP settings and permissions, and isolate plugins or the theme.

    IntermediatecPanel hosting3 min read

  • Fix a 500 Internal Server Error on cPanel hosting

    Find and fix the cause of a 500 Internal Server Error on any cPanel site: broken .htaccess rules, wrong permissions, PHP version or memory problems and script errors.

    IntermediatecPanel hosting2 min read

  • Fix a Virtualizor slave server that shows offline

    Troubleshoot Virtualizor master-to-slave connection problems: check network and ports, the slave service, API key, licence status, disk space and recent firewall changes.

    AdvancedVirtualizor admin2 min read

  • Fix apt errors: dpkg lock, interrupted installs and broken packages

    Solve common apt and dpkg errors on Ubuntu and Debian: could not get lock, dpkg was interrupted, unmet dependencies, held packages and repository signature errors.

    IntermediateLinux VPS3 min read

  • Fix common Composer errors on a server

    Solve frequent Composer problems: memory exhausted, PHP version or extension requirements, dependency conflicts, lock file mismatches, authentication and running as root.

    IntermediatecPanel hosting · Linux VPS3 min read

  • Fix common errors when creating cPanel accounts in WHM

    Solutions for the errors resellers see most when creating cPanel accounts in WHM: domain already exists, username taken, out of allocation, package limits and DNS problems.

    BeginnerReseller hosting2 min read

  • Fix common Git errors when deploying on a server

    Fix the Git errors that block deployments: dubious ownership, local changes would be overwritten, divergent branches, permission denied (publickey) and authentication failed.

    IntermediateLinux VPS · cPanel hosting3 min read

  • Fix common Laravel errors after deployment

    Fix the Laravel errors that appear most after deploying: 500 with no message, 419 Page Expired, No application encryption key, storage permissions, cached config and missing vendor.

    IntermediatecPanel hosting · Linux VPS3 min read

  • Fix common Magento 2 errors

    Solve the Magento 2 errors you hit most often: missing CSS after deploy, indexers stuck, cron not running, OpenSearch connection failures, memory exhausted, permissions and maintenance mode.

    AdvancedLinux VPS · cPanel hosting3 min read

  • Fix common Node.js errors: EADDRINUSE, 503, out of memory, module not found

    Fix the Node.js errors hosting customers see most: port already in use (EADDRINUSE), 503 on cPanel, JavaScript heap out of memory and Cannot find module.

    IntermediatecPanel hosting and Linux VPS3 min read

  • Fix common Plesk problems yourself with Repair Kit

    Use the Plesk Repair Kit extension to restart services, fix file permissions, repair databases and check DNS, and learn the admin plesk repair command for deeper fixes.

    BeginnerPlesk2 min read

  • Fix common Remote Desktop (RDP) errors on a Windows VPS

    Fix the Remote Desktop errors you will meet on a Windows VPS: can't connect, internal error, CredSSP, licensing, account locked, black screen and too many sessions.

    IntermediateWindows VPS3 min read

  • Fix common SSL errors in the browser

    Understand and fix common browser SSL errors: name mismatch, expired or untrusted certificates, incomplete chains, protocol errors and HTTPS redirect loops.

    IntermediateAll hosting3 min read

  • Fix CORS errors: "No 'Access-Control-Allow-Origin' header"

    Understand browser CORS errors when a frontend calls an API on another domain, and fix them correctly in the app, Nginx or Apache, including preflight requests and credentials.

    IntermediateLinux VPS · cPanel hosting3 min read

  • Fix Docker "exec format error" (ARM vs x86 images)

    Fix 'exec /usr/local/bin/docker-entrypoint.sh: exec format error' and platform mismatch warnings by building multi-architecture images or pulling the right platform.

    IntermediateLinux VPS3 min read

  • Fix Docker daemon not starting

    Docker service failed to start? Read the real error with journalctl, then fix an invalid daemon.json, conflicting options, storage driver and overlay errors, a full disk or iptables problems.

    IntermediateLinux server5 min read

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