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Connect to private endpoint of azure app service

I have one Azure app service (App Service A) configured with private endpoints, within which I have an API (API 1). Additionally, I have another Azure Cloud Service (extended support) (App Service B), which is a public/normal Azure app service. My objective is to establish a connection to API 1 from App Service B. Both app services reside in the same VNet.

I’ve come across a similar post with the same query but couldn’t find the actual solution. When attempting to call the private endpoint (https://testprivateendpoint.privatelink.azurewebsites.com), I encounter exceptions:

  1. AuthenticationException: The remote certificate is invalid according
    to the validation procedure.
  2. WebException: The underlying connection
    was closed: Could not establish trust relationship for the SSL/TLS
    secure channel.
  3. HttpRequestException: An error occurred while
    sending the request.
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Figured out what I was doing wrong. Basically, instead of using https://testprivateendpoint.privatelink.azurewebsites.com, I have to use https://testprivateendpoint.azurewebsites.com.


  2. 0

    Check that DNS resolution is setup to resolve the private endpoint URL to its private IP.

    App Service B does not seem to trust the cert presented by API 1. Is the cert self-signed?

    You may have to handle the cert validation in your App Service B code, but this is considered insecure due to the risk of MItM attacks.

    Hope this helps.

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