MacMini on a Windows Server 2008 R2 domain. Worked fine when running Lion. Upgraded to Mountain Lion. First sign of trouble was at the logon screen; a red X and the words "Network drives not available." In Finder > Connect to Server, I can't seem to connect with any pattern of server names or IP addresses.
Any help will be much appreciated.
Fortunately I've run into this on an extra MacMini I bought for this very purpose, and not any of my production machines.