Summary

502 Bad Gateway errors occur when an OpenResty server fails to connect to a database or service due to authentication failures, timeout errors, or permission issues. This error message typically indicates that the server cannot establish a connection with a specific resource despite having access to valid credentials. The most common causes involve incorrect database password configurations or firewall blocking requests that lack proper headers. Additionally, the server may be unable to retrieve a cached resource for a given path, causing it to send the 502 error back to the client even after a successful authentication handshake.

This error is a critical signaling mechanism that requires immediate investigation. To resolve it, verify database connectivity by accessing the server directly or through a diagnostic tool. Check database credentials closely against production settings to ensure authentication protocols align. Furthermore, examine web traffic logs to identify if the connection is failing at the network layer, such as a DNS misconfiguration or a physical hardware failure. Addressing these underlying issues directly is necessary before attempting to upgrade the OpenResty version or updating the configuration file again.

Title

502 Bad Gateway

Description

502 Bad Gateway

Keywords

gateway

Categories

News & Media

NS Lookup

A 62.50.112.200

Dates

Created 2026-03-07

Updated 2026-03-07

Summarized 2026-03-23