Backend Nginx works just fine with https, but the application gateway https health probes fail with the message "Backend server certificate is not whitelisted with Application Gateway." What is the deal here? An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. Would you like to involve with it ? For information about how to configure a custom probe, see the documentation page. -> Same certificate with private key from applicaton server. My issue was due to the root certificate not being presented to appgw, and resulted in the error: "The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. Check whether the server is listening on the port that's configured. In this article I am going to talk about one most common issue backend certificate not whitelisted, If you check the backend health of the application gateway you will see the error like this The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. For new setup, we have noticed that app gateway back-end becomes unhealthy. successfully, Application Gateway resumes forwarding the requests. Or, you can use Azure PowerShell, CLI, or REST API. Access the backend server locally or from a client machine on the probe path, and check the response body. If the domain is private or internal, try to resolve it from a VM in the same virtual network. c. Check whether any NSG is configured. Certificates signed by well known CA authorities whose CN matches the host name in the HTTP backend settings do not require any additional step for end to end TLS to work. Export trusted root certificate (for v2 SKU): c. Check to see if there are any default routes (0.0.0.0/0) with the next hop not set as Internet. Every documentation page has a feedback section at the bottom. Your email address will not be published. To do end to end TLS, Application Gateway requires the backend instances to be allowed by uploading authentication/trusted root certificates. Backend protocol: HTTPS Backend port: 443 Use well known CA certificate: Yes Cookie-based affinity*: Disable Connection draining*: Disable Request time-out*: 20 seconds Override backend path*: Blank Override with new host name: Yes Host name override: Override with a specific domain name (webappX.hugelab.net) Use custom probe: Yes
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