Im setting up a web app in an App Service environment with Application Gateway I constantly get error 502. I have set up custom probe and no NSG currently on app gateway subnet so that shouldnt be an issue. On the App service Environment subnet NSG have allowed traffic from the APP Gateway subnet in for health probes but stiil get that annoying 502 error. My backend health in the app gateway always shows such a useful error message of " Unhealthy Unknown error. Please try again." Been trying again and again and always same error!
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Yes but I have a custom probe set up to check the hostname of the webapp eg myapp.mydomain.com. it's set to use HTTPS . A .pfx and .cer have been added to the web app. The certificate also uploaded to app gateway and the web app and also bindings added. What else can I configure ? The backend pool of the app gateway points to the IP of the load balancer in the app service environment
– itye1970
1 Answers
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As we have no way of knowing what is wrong with your app we cant help you, but if the backend health shows errors application gateway wont route traffic to the application. you need to fix your probes and it will work.
By default a probe is considered healthy for application gateway if it received HTTP response 200-399.
