Summary

Okay, here's a summary of the website content regarding a 502 Bad Gateway error with Microsoft Azure Application Gateway v2:

The 502 Bad Gateway error indicates that the Application Gateway itself couldn't reach the backend server it was trying to route traffic to. This usually means the backend server is temporarily unavailable, overloaded, or experiencing a network issue. Common causes include:

* Backend Server Unreachable: The primary cause - the server(s) behind the Application Gateway are down, unresponsive, or experiencing connectivity problems.
* Backend Server Overload: The backend server is receiving too many requests and is unable to process them all, leading to timeouts.
* Network Issues: Problems with the network connection between the Application Gateway and the backend servers (firewall rules, DNS resolution issues, routing problems).
* Application Errors: Errors within the application running on the backend server can cause it to become unresponsive, triggering the 502.
* Application Gateway Configuration: Issues with the Application Gateway’s routing rules, connection settings, or scaling settings could contribute to the problem.
* Health Probes: Problems with the health probes configured for the backend servers.

Troubleshooting Steps: Often involve checking backend server status, examining Application Gateway logs, verifying network connectivity, and reviewing application health. Azure provides tools for monitoring and diagnosing these issues.

Title

502 Bad Gateway

Description

502 Bad Gateway

Keywords

gateway, azure, application

NS Lookup

A 172.166.112.101

Dates

Created 2026-02-14

Updated 2026-02-14

Summarized 2026-03-02