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domain	moore-southafrica.com
summary	Here’s a summary of the website content regarding the 502 Bad Gateway error related to Microsoft Azure Application Gateway v2: The 502 Bad Gateway error indicates that the Application Gateway itself received an invalid response from an upstream server it was trying to reach. This commonly happens when the backend server(s) – like an App Service, VM, or another Application Gateway – are unavailable, overloaded, or experiencing issues. Key Causes: * Upstream Server Issues: The most frequent cause. This includes servers being down, experiencing high load, or having network connectivity problems. * Application Errors: Problems within the application running on the upstream server causing it to return an invalid response. * DNS Resolution Problems: The Application Gateway might be unable to resolve the hostname of the upstream server. * Network Issues: Problems with the network connection between the Application Gateway and the backend servers. * Configuration Errors: Incorrectly configured routing rules or backend settings within the Application Gateway. * Azure Service Outages: Rarely, a broader Azure service outage can contribute to this error. Troubleshooting Steps: * Check Upstream Server Status: Verify the health and availability of all backend servers. * Review Application Logs: Examine the logs of the backend servers for errors. * Test Connectivity: Try to ping or connect directly to the backend servers from the Application Gateway. * Examine Application Gateway Logs: Check the Application Gateway's logs for detailed error messages and potential configuration issues. * Validate Routing Rules: Ensure the routing rules in the Application Gateway are correctly configured to point to the correct backend servers. * Azure Health Status: Check the Azure service health dashboard for any reported outages affecting the relevant services. Essentially, a 502 Bad Gateway with Azure Application Gateway v2 points to a communication problem between the gateway and its backend resources, requiring investigation of the upstream servers and the connectivity between them.
title	502 Bad Gateway
description	502 Bad Gateway
keywords	gateway, azure, application
upstreams
downstreams
nslookup	A 20.234.19.161
created	2026-02-15
updated	2026-02-15
summarized	2026-02-15

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