T2 - Help!

I received my T2 a few days ago. Inputted the information for one of my servers; it connected very quickly and I was able to watch tv.

I then inputted the information for another server. I was again able to watch tv on the second server. However, when I switched back to the first server, I got the message "portal unavailable".

I rebooted but again got the same message. A factory reset did not help. I contacted my reseller, he rechecked the proper input of my T2 mac and confirmed that everything was okay.

Are some servers not compatible with the T2? If not, what about the fact that it worked initially, but failed to work after switching from one server to another?

Would appreciate any help or suggestions. Thanks.