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Fix 502 Bad Gateway – nginx, PHP-FPM & Plesk

Website shows 502 Bad Gateway? nginx, PHP-FPM crashed, Plesk error, disk full – webspace troubleshooting step by step.

Webspace

Quick answer: 502 Bad Gateway: restart PHP-FPM, check disk space, disable faulty plugin and increase PHP memory_limit.

If you landed here: Browser shows "502 Bad Gateway" instead of your website.

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Frequently asked questions (FAQ)

502 Bad Gateway – what does it mean?
Web server (nginx) can't reach backend (PHP-FPM). PHP process crashed, overloaded or disk full.
502 after plugin update (WordPress)?
Disable plugin via FTP (rename folder in wp-content/plugins). Increase PHP memory limit.
502 only sometimes?
PHP-FPM max_children too low or RAM limit hit. Plesk → PHP settings → increase memory_limit.
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