SSL Connection Problem with Xamarin

Marco Spallone 1 Reputation point

I have a Xamarin cross-platfrom application. It works fine on Android Emulator, but I've connected an Android device to debug mode and when i try to make an HTTP request I have the following error:

"System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. ---> Mono.Btls.MonoBtlsException: Ssl error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER at /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/boringssl/ssl/tls_record.c:217"

Can I solve it?

Thank you very much!

A Microsoft open-source app platform for building Android and iOS apps with .NET and C#.
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  1. Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 27,126 Reputation points Microsoft Vendor

    Hello @Marco Spallone ,

    This error means that there is something wrong when verifying server certificates. You could check if the server only has the wildcard certificate keychain or miss the certificate authority.
    As the native Android document describes, Android typically trust only root CAs directly, which leaves a short gap of trust between the server certificate—signed by the intermediate CA—and the certificate verifier, which knows the root CA. To solve this, the server doesn't send the client only it's certificate during the SSL handshake, but a chain of certificates from the server CA through any intermediates necessary to reach a trusted root CA.

    For more details, please refer to this doc:

    Best Regards,
    Wenyan Zhang

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