EOF when connecting via secure connection about opcua

[JeremyTheocharis]

What we already tried:

• #658 does not apply as we checked manually that the generated Key Size matches the one which the server excepts
• #593 does not apply, because it works with UAExpert without any problem (and they are using self-signed certificates as well)

[magiconair]

Hmm, it says Certificate Validation failed. Reason=BadCertificateUntrusted.

I vaguely remember that there were some weird issues with padding. I assume you've done all the obvious stuff, like marking the certificate as trusted in the server.

The other thing you could try is to create a root certificate and sign a client certificate with that. Then import the root cert into the server as a trusted authority to see if that changes anything.

I am not the expert on the crypto code. @dwhutchison do you maybe have an idea?

[JeremyTheocharis]

Thank you for your reply! I assume it has nothing to do with trusting the certificate, as other clients as UAExpert and other tools can access the server without their certificate being needed to trust.

We could try your approach with the root certificate, maybe even let it create with a different tool. With this we could check if there is a problem with the certificate generation, or if its with the secure connection.

@dwhutchison If you have any other pointers for us, that would be great!