I've got a WSUS Server setup and when some servers try and get updates they fail with 80072EE2 "Windows Update encountered an unknown error." The Get help link that Microsoft has so generously provided opens the Windows Help and Support which checks the net for ""WindowsUpdate_80072EE2" "WindowsUpdate_dt000"" and comes back with 0 results. Removing the dt000 error does nothing for me.
Everything I've found on the net says it's a network or firewall problem. There's no problem accessing the WSUS server from the network (they are all VMs on the same physical servers). I can browse to the webserver on the WSUS machine and get back the default website.
Other servers at the colo patch them selves just fine.
Windows Firewall is disabled on the machines in question, as are the third party firewalls.
Any ideas what else to check? The machines with the problem are running Windows 2008, as is the WSUS server.