Getting "Mono.Btls.MonoBtlsException: Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED" all of a sudden.

[abeerkhan99]

I have a Xamarin.Forms application running, and everything was working fine until recently. However, it's starting to throw this error these days:

VimeoDotNet.Exceptions.VimeoApiException: Error retrieving information from Vimeo API. ---> 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:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED

The iOS application is working fine, I can access the videos. It's just the Android application that is not working anymore. Changing the HTTPClient and SSL Implementation did not help at all. I don't know why this is happening all of a sudden. Any help would be much appreciated!

[mfilippov]

Maybe you have an issue with trusted roots on your device? Could you check is https connection work on: https://api.vimeo.com from your device?

[mfilippov]

As far as I see Vimeo use Let's Encrypt Certificate and some old Android devices had issue with that. Please take a look this article: https://community.letsencrypt.org/t/letsencrypt-certificates-fails-on-android-phones-running-android-7-or-older/205686