Troubleshooting WordPress 502 Errors

Causes
If WP throws 502 errors and pages cannot be accessed, there is generally a problem with the server, either with WP themes or plugins, or with MySQL or PHP-FPM.

  • All pages cannot be accessed: server is down, but generally will throw a 504 error – 1 2
  • Cannot access /wp-admin/ pages: check MySQL configs, PHPFPM configs, and server resource usage
  • Cannot access dynamically generated wp content pages: check plugins and themes

General Fixes

  • Disable plugins or themes – 1 2
  • Check PHP(FPM) config – 1
  • Check MySQL config – 1
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