Vista computer drops offline intermittently

Hi all,

I have recently added some Vista Ultimate workstations onto a network.  The DC is Server2003. The Vista boxes drop offline intermittently. When they are in this state I can't ping anything on the network; not the router, DC, yahoo.  A reboot fixes the problem but it is happening several times a day. Sometimes it will just fix itself after an hour or so.

I have run Dell diags on one workstation and the nic seems fine.  The other two are HP.  None of the XP boxes have this issue.

II've reloaded nic drivers, killed the firewall (uninstalled KAS) and ensured that the Windows firewall is off. The event logs are clean until it drops and I get an error no domain controller available.  That message makes sense since I cant ping anything when the Vista boxes are in this state. All three are running Vista Ultimate SP1.

Ive seen this complaint all over the place but have not found a solution. Any ideas?

Thanks
Lee

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ccampbell15Asked:
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ccampbell15Connect With a Mentor Author Commented:
Turns out this was caused by the AT&T dialer. For access to Medicare they need that thing, Geez.
Disable under properties for the nic and then renable when they need the AT&T VPN. Still trying to figure out how/why the ATT dialer does that.
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zvitamConsultantCommented:
Try to reset using "netsh winsock reset" command.

If it works, then the problem might be in your anti-virus or firewall application.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Sometimes you only need to disable and re-enable the NIC driver - that is what I do, and that works for me.
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ccampbell15Author Commented:
I tried the suggestions to no avail.  When the systems are in a failure mode that cannot ping anything. Sometimes a reset of the Ethernet cable restores connection sometimes I need a reboot. One thing I just found in common is that the embedded LAN adapter is a realtek 8168C, Dounload / installed latest driver from realtek and also tried the updates on microsoft.

This issue seems like its all over the but no solutions that I can find.

R
Lee
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ccampbell15Author Commented:
Oh, no firewall or AV at this point on one box I'm using as my test case. I have also killed defender on that box.
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zvitamConsultantCommented:
Try the following:

Connect a Vista machine to a place where XP machine is connected.
Connect an XP machine to a place where vista machine is connected.

If you don't have the connection drops anymore than you have a network infrasturture problem.(wiring)
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ccampbell15Author Commented:
did that alreadt, Vista boc still screwed up, XP OK
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zvitamConsultantCommented:
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ccampbell15Author Commented:
The one thing I didn't know about in that article was the uSoft network connectivity tool. It says everything is fine.  Something has to be screwed up with Tcpip.
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