Hi @karsten-meichsner_9039 ,
This error is happening at the SSL-level, which is managed by the operating system (platform). There's nothing you can configure in ProGet to resolve this, so you'll need to make some changes to the operating system.
Can you tell me, are you using ProGet for Windows, or on Linux (Docker)? In either case, you'll need to trust the root certificate, but the ways to do this are a bit different.
In Windows, the easiest way is to install the certificate using the UI (Certificates-Current User > Trusted Root Certification Authorities into Certificates (Local Computer) > Trusted Root Certification Authorities). You can also verify that the installation was successful by trying to navigate to a URL in your S3 bucket.
In Linux/Docker, it's a bit trickier; in general you'll want to copy the .crt into /usr/local/share/ca-certificates and then run /usr/sbin/update-ca-certificates. There's a few ways to do this, but one common way is to build a docker image on top of our image. You can also SSH into the running container and handle this as well.
Cheers,
Alana