Vista - Guests losing network inconsistently

I have Windows 2003 R2 SP1 Enterprise Ed, DELL PE6850 with MS Virtual Server
2005 R2 SP1 2 NICs, one dedicated to the host and another dedicated to the
guests. On the NIC for the guests I have disabled Client for MS Networks,
FPS and TCP/IP to resolve some performance issues. Which it did and worked
for about 3 weeks.

Now after a few hours of inactivity two of my guests lose network
connectivity. Usually logging in will kick them back, no reboot is actually
required. another interesting point is both have SQL, one 2000 Enterprise,
the other 2005 Express.

I have also tried to disabled TOE (refer to support.microsoft.com/kb/888750,
method #3)

Any thoughts of what I can try next??

Banging my head against the wall,
Graham M

On Tue, 12 Aug 2008 09:43:03 -0700, Graham M
<GrahamM@xxxxxx> wrote:
Most current drivers?

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.

Did you get a resolution to this by installing new drivers? I have an HP
DL385 with same issues. Diferent NIC.

"Steve Jain" wrote:

I am reluctant install new drivers, since this is a recent problem and was
functioning flawlessly prior to two changes:

Install of SCOM/MOM2007 SP1 RTM
Install of WMI hotfix (KB933061)

Right now I am considering rolling back the hotfix.

"Ed" wrote:

I'm having a similar problem. Server2003 R2 host, same for guest, guest
running sql 2000 Enterprise. The host machine will randomly lose
connectivity, and only a reboot seems to work. This is very disruptive, of
course, because now both machines are down. Interestingly, sometimes the
host is down, but you can RDP into the guest OS. Sometimes it's the other
way around.

"Graham M" wrote:

Right now I have a scheduled tasks running every five minutes that pings my
guests and has seen to be a suitable workaround.

"LoneWolf" wrote: