I have installed a second Domain and PostOffice on a Windows 2012R2 Server. Primary Domain and PO works on a SLES11 Server.
Install run fine and i was able to create secondary domain and po.
But i'm not able to log into the gw admin console on the windows server.
There is an error message:
"Domain server not trusted. If you trust this server, add the server certificate to the trust store"

Which certificate does it mean?

Logon to the admin console on primary server works