Summary

Here’s a summary of the content found on the Microsoft Azure Application Gateway v2 502 Bad Gateway error page:

The 502 Bad Gateway error indicates that the Application Gateway itself encountered a problem while communicating with the backend server(s) it’s routing traffic to. This means the gateway successfully received the request, but the backend failed to process it correctly and return a valid response within the allotted time.

Common Causes:

* Backend Server Issues: The most frequent cause is a problem with one or more of the servers behind the Application Gateway – this includes issues like server downtime, high load, application errors, or network connectivity problems.
* Timeout Settings: The Application Gateway might have a timeout setting configured that's too short for the backend to respond, causing the gateway to time out and return a 502 error.
* Network Connectivity: Problems with network connectivity between the Application Gateway and backend servers can trigger this error.
* Application Errors: Errors within the backend application itself can cause it to fail to respond, leading to a 502 error.
* SSL/TLS Issues: Problems with SSL/TLS certificates or configurations can also contribute.

Troubleshooting Steps (as presented on the page):

1. Check Backend Server Status: Verify that the backend servers are running and accessible.
2. Review Application Logs: Examine application logs on the backend servers for errors.
3. Examine Application Gateway Logs: Inspect the Application Gateway logs for specific details about the error.
4. Adjust Timeout Settings: Increase the timeout settings in the Application Gateway configuration if needed.
5. Verify Network Connectivity: Ensure proper network connectivity between the gateway and backend servers.
6. SSL/TLS Verification: Confirm correct SSL/TLS certificate installations and configurations.

The page emphasizes checking both the Application Gateway and the backend servers for issues. It provides guidance on how to diagnose and potentially resolve the problem.

Title

502 Bad Gateway

Description

502 Bad Gateway

Keywords

gateway, azure, application

NS Lookup

A 20.105.248.122

Dates

Created 2026-03-14

Updated 2026-03-14

Summarized 2026-03-17