An FQDN used for backend pool members might not resolve correctly by the user configured DNS server for the VNet. Similarly, the presence of a custom DNS in the VNet could also cause issues. The NSG/UDR could be present either in the application gateway subnet or the subnet where the application VMs are deployed. This issue causes probe failures, resulting in 502 errors. If access to the backend is blocked because of an NSG, UDR, or custom DNS, application gateway instances can't reach the backend pool. Network Security Group, User Defined Route, or Custom DNS issue Cause
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