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HTTP and Server Errors Troubleshooting

Decode HTTP status codes and browser connection errors—from 403 and 404 to 500, 502, 503, 504, and ERR_ connection failures.

48 topics · 12 published guides

Common symptoms

  • Specific HTTP status code on one or all pages
  • Browser ERR_ connection messages
  • Gateway timeouts under load
  • Origin down behind a CDN
  • Too many redirects

Start here

  1. 01 Record the exact status code or ERR_ message
  2. 02 Test the origin URL bypassing CDN if possible
  3. 03 Check server and application error logs
  4. 04 Note whether the error is global or path-specific

Most common problems

6 signals
403 Intermediate Server Errors

403 forbidden

Learn what causes “403 forbidden,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: 403 forbidden

404 Intermediate Server Errors

404 not found

Learn what causes “404 not found,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: 404 not found

500 Intermediate Server Errors

500 internal server error

Learn what causes “500 internal server error,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: 500 internal server error

502 Intermediate Server Errors

502 bad gateway

Learn what causes “502 bad gateway,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: 502 bad gateway

503 Intermediate Server Errors

503 service unavailable

Learn what causes “503 service unavailable,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: 503 service unavailable

504 Intermediate Server Errors

504 gateway timeout

Learn what causes “504 gateway timeout,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: 504 gateway timeout

All problems in this category

Showing 48 topics · 12 published guides

Related categories

Frequently asked questions

What is the difference between 502 and 503? +
502 usually means a gateway got an invalid response from upstream. 503 means the service is unavailable or overloaded and may recover when capacity returns.

Repair dispatch

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  • You will receive a clear explanation of the likely cause.
  • We will tell you if the issue falls outside our repair scope.
  • No additional work will be performed without approval.
  • A backup should be created whenever access and website condition allow it.
Emergency repair Request diagnosis

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