Fixing validation on ubuntu 20.04 from my Xamarin app using restsharp

Hi everyone.
Unfortunately, I still haven't a solution for my personnal case.
I'm unable to contact my API on a aws s3 ubuntu 20.04 from my Xamarin app using restsharp (it's working fine with postman or chrome).
I have a Trustfailure error.

I tried this Help thread for DST Root CA X3 expiration (September 2021) - #409 by dmaehler , and the X3 is no more in my SSL path, checked it with SSLabs.

I tried to update ca-certificates 20210119~20.04.2 but i'm not 100% I did it well.

I tried to use cert-sync (if I understand well, mono use is own certificates and this link them with ubuntu's ?)

I don't know what I can do, if you have any clue

Hi @Toows, welcome to the LE community forum :slight_smile:

Can you share:

  • domain name
  • OpenSSL version
  • port used (if other than 443)

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