Nginx Diagnostics & Fault Manuals

High-performance reverse proxy, load balancer, and HTTP cache.

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Equipment Models

Hardware families produced by Nginx

1 Series

Nginx Web & Reverse Proxy

1 guides

Class: Web Server & Gateway

Browse Fault Codes

Indexed Error Codes for Nginx

Machine-verified error code diagnostic walkthroughs

1 Manuals

CODE 502 Nginx Web & Reverse Proxy High

502 Bad Gateway

HTTP status 502 Bad Gateway indicates that Nginx, acting as a reverse proxy or load balancer, received an invalid response or no response at all from the upstream backend server (PHP-FPM, Node.js, Python Gunicorn, or Go microservice).

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