20/07/2026
What Exactly Is a 502 Bad Gateway Error? A 502 bad gateway error means your web server (Nginx or OpenLiteSpeed) tried to talk to another server usually PHP-FPM or a reverse proxy but got no valid response. Think of it like calling a friend who hangs up before answering. The call connects, but nothing comes through. In WordPress terms, that “friend” is often PHP-FPM, the service that runs your PHP code. Unlike a 404 or 500 error, a 502 isn’t about missing files or broken code. It’s about communication failure. And because Nginx and OpenLiteSpeed handle requests differently than Apache, the troubleshooting steps are unique. Let’s break them down.
How to Fix 502 Bad Gateway Error on Nginx and OpenLiteSpeed You refresh your WordPress site, and suddenly 502 Bad Gateway. The screen stares back, cold and