Here's a good one. I have successfully joined a SBS2003 domain with a Windows 8 Pro computer. And I can successfully login as the domain administrator. But when I go into Control Panel, Users and try to add a domain user I get the message that this computer is having problems communicating . . . see attached. I've removed Norton's and the DNS settings are correct. I'm going to try and create a new Domain Admin to see if this works. But in the meantime, if anyone has seen this error before, please chime in. Thank you.