I have 3 party certificate(Comodo wildcard) which I would like to add our GroupWise agents(mta, poa, gwia). I'm facing some kind of problem with private key based on what the error message say:
MTA error: SSL Configuration has been disabled because of failure in setting up SSL rc= [891D]

SSL Certificate File: I have combined server certificate with bundle which I got with the certificate.
Private key: base64 encoded, no password, PKCS8. Tried also PKCS1 format. I also tried set password.

Certificate and private key matches because those are use in other services + checked with openssl modulus.

If someone can point me to the right direction I would appreciate that!