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Cloudflare Errors and Troubleshooting

Diagnose Cloudflare 5xx errors, SSL mode conflicts, firewall blocks, cache serving old content, and Rocket Loader side effects.

45 topics · 11 published guides

Common symptoms

  • Cloudflare-branded 520–526 pages
  • Flexible SSL redirect loops
  • wp-admin or REST API blocked
  • Old CSS or pages after updates
  • Challenge loop for legitimate visitors

Start here

  1. 01 Note the exact Cloudflare error code
  2. 02 Test with proxy paused (DNS only) if safe
  3. 03 Confirm SSL/TLS mode matches the origin certificate
  4. 04 Review firewall, WAF, and rate limiting events

Most common problems

6 signals
520 Intermediate Cloudflare Errors

Cloudflare error 520

Learn what causes “Cloudflare error 520,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: Cloudflare error 520

522 Intermediate Cloudflare Errors

Cloudflare error 522

Learn what causes “Cloudflare error 522,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: Cloudflare error 522

525 Intermediate Cloudflare Errors

Cloudflare error 525

Learn what causes “Cloudflare error 525,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: Cloudflare error 525

Intermediate Cloudflare Errors

Cloudflare blocking wp-admin

Learn what causes “Cloudflare blocking wp-admin,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: Cloudflare blocking wp-admin

521 Intermediate Cloudflare Errors

Cloudflare error 521

Learn what causes “Cloudflare error 521,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: Cloudflare error 521

524 Intermediate Cloudflare Errors

Cloudflare error 524

Learn what causes “Cloudflare error 524,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: Cloudflare error 524

All problems in this category

Showing 45 topics · 11 published guides

Related categories

Frequently asked questions

Does error 522 mean WordPress crashed? +
Not necessarily. 522 means Cloudflare timed out connecting to your origin—often firewall, downed server, or wrong origin IP.

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