This is a weird one for me. We have a total of 10 servers. 4 x Windows 2003 and 6 x Windows 2008. Yesterday all Windows XP machines stopped being able to access the shared printers and folders from one of the servers. "net view server01" returns system error 64 after several minutes on every single NT 5.x based machine I've tried it on (at least 15), a mix of Windows 2003 and XP machines.
From my Windows 7 laptop and from every single 2008 based server (NT 6.x) it works straight away.
A reboot of the server fixes the problem for about 5-10 minutes before all NT 5.x based clients stop working again.
I've swapped all the switches out, just in case it was a network issue, but it hasn't fixed it. I also removed Kaspersky from an XP machine, but that had no effect either.
The server in question in a Windows 2008 R1 Hyper-V VM running on Windows Server 2008 R2.
There is nothing in the event log of the server that seems to be relevant. Any ideas of where to look or what might be causing this?