Windows Server 2008 File Server Connectivity Problem

I have implement Windows Server 2008 Standard 64 bit in a work group environment, as a file server. The hardware is 2950 The clients are windows XP The problem is that when I map the network share drive of this server to the users,,,,for a while it works fine but after sometimes they just lose the mapped drive and when they want to connect they can't.

The DHCP and DNS is on a different server Windows Server 2003 I have a print server in windows server 2003 which works fine.

The event view errors in file server 2008 are
Event ID 2012, SRV........15016, HTTP Event

The event ids errors in client computers are
Event ID .6004 and 3019

Please help me ASAP
RazbaanAsked:
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Darius GhassemCommented:
Disable IPv6. Then when you are in the TCP\IP properties click on the Configure button go to Advance then disabled TCP Checksum, IP Checksum, and TCP Large Send Offload. Do you have Symantec Endpoint?

http://support.microsoft.com/kb/951037
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RazbaanAuthor Commented:
yes we have symantec Endpoint protection
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Darius GhassemCommented:
That is your problem most likely. We have fully removed SEP from all sevrers since it has been stopping all network services. If you call Symantec you can get the cleanwipe tool to fully remove.
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