I had the same problem, It was caused by Symantec endpont protection
Look for a patch at symantec.

/Niklas

Willem Zonnevijlle;2606471 Wrote:
> In my case it's not enough. Let me explain what is the problem.
> I administer 3 fileservers running Win2003 R2 x64 with 2 dualcore AMD
> Opteron Processors and 8GB memory. Main storage is on a Equalogic
> iSCSI
> device connected with MS iSCSI initiator over a dedicated 1GB network.
> The
> average number of users connected to each fileserver is about 1100 Part
> of
> their userprofile is redirected ro their homedir. The roaming part of
> their
> profile is stored on a separate partition. Network load is minimal: on
> the
> iscsi network ranging from 0,1% to 2% max. On the regular network from
> 2-9%
> max. Backups are made over the network with Legato Networker and the
> antivirus solution is Symantec Antivirus 10.x in a managed
> environment.
> At irregular intervals one of the fileservers freezes and the users
> loose
> their connection to their profile and home directories although the
> machine
> iresponds to pings. On the console the windows explorer is frozen
> (doesn't
> respond).
> But, from a command window which is always open I can browse all
> partitions
> and drives. Nothing is logged in the eventlogs and the only solution is
> to
> reboot the machine by using the powerswitch.
> My first suspicion was a memory leak, but I can't find it, nor by
> using
> memsnap, nor by using poolmon. So, I am wondering whether I'm using the
> right
> method to discover a leak.
> The problem is very annoying


--
Niklas
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