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.

PHP-FPM max_children too low or RAM limit hit. Plesk → PHP settings → increase memory_limit.

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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