Windows 2003 Network issues after installing SP1

The problem occur after installing SP1 on Windows 2003. The network connection break up once in a while. This issue is the same as the one described in the following thread:

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Windows 2003 SP1 Network issues?
http://www.eggheadcafe.com/aspnet_answers/windowsservernetworking/Jun2006/post27056454.asp

Does anybody know of any known issues with Windows 2003 server and Service  
 
Pack 1?  I have multiple customers now reporting problems, and the apparent  
 
similiarity is SP1.  For example, I have one customer that works fine when  
 
the server is pre-SP1.  Everything works great.  Then, they apply SP1, and  
 
immediately, they start having network drops, etc.  Our application  
 
establishes a connection and stays connected, so when they drop, it affects  
 
our app.  If they uninstall SP1, the problem goes away.
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This was happening with one of the server and we though tits the hardware issue. Disabling the network card bring up the network. Yesterday I applied SP1 on another Windows 2003 machine and it had the same issues. Any ideas?
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nauman_ahmedAsked:
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nauman_ahmedAuthor Commented:
Thanks for the reply Netman66 :). I just installed 899148. Lets see what will happen.

-Nauman
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nauman_ahmedAuthor Commented:
This issue was actually due to Windows 2003 SP1 RC2. Earlier release of SP1 like the ones that was released in late 2005 did not have this issue. Removing the SP1 solved the issue.

--Nauman.
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