Network Connectivity Stops Randomly To Our Windows 2008 Server - But Not For All Clients

Dear Experts,

I have a wierd problems that I am hoping that you can help me with.

We have approx 500 Windows XP clients in our offices connected to our Windows 20008 R2 domain. There is a member server also running Windows 2008 (not R2) with our MIS system running on SQL 2008 R2.

Frequently, perhaps 7 or 8 times a day, different users will complain that they have lost connectivity to the MIS, and that they cannot access any information.

When I visit the user, I can see that the member server itself cannot be pinged until I reboot or refresh the network connection (ipconfig /release, ipconfig /renew).

What makes this particularly strange is, the other computers in the office are still accessing that MIS server fine and pings are successful.

Minutes later, a completely different user would complain about the same problem, and yet everyone else is working fine.

Any help would be greatly appreciated. This is causing real frustration.

Many Thanks
andymellorAsked:
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andymellorConnect With a Mentor Author Commented:
Found the issue. It was a problem with the core switch that upgrading the firmware sorted out.

Many thanks for the suggestions etc
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AngloCommented:
Try flushing the users arp table and ping again.  Do you have multiple interfaces on the MIS server?  There may be some issue with teaming and mac addresses.
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JumboGeekCommented:
Do you have any firewall software on the clients, have you tried disabling the advanced firewall on the dc to narrow the issue down?
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InteraXCommented:
Have you tried looking in the event log for any clues.
Also have you tried updating their group policy? gpupdate /force
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andymellorAuthor Commented:
Clearing the ARP cache on the server seems to work. What causes this? Should it be routine thing that needs to be done?

There isn't any Firewall software on the clients at present.

There isn't any reference to anything remote related in the event viewer. I have tried running GPUPDATE /Force a few times.

Cheers
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AngloCommented:
Should normally not be a problem as the ARP entries should time out.  Do an ipconfig /all on a user that has a problem and see when the DCHP lease was obtained.
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Darius GhassemCommented:
Run through this link.

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/Q_26176031.html

Make sure you remove any AV installed on this system for testing
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