Yesterday morning I got the call, “the printers are down!”. Bad news — printing and file sharing are the two biggest customer interactions we have. Turns out the print server would process connections fine to it’s actual hostname, but not to it’s cname. This was directly after installing Server 2008 R2 SP1. I googled around, and found this guy with the -exact- same story. Rejoining my servers to the domain worked like a charm.