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PC Locks Up Everyday around 5pm

Posted on 2009-02-21
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Last Modified: 2013-12-02
I have a small office running SBS 2003.  Their server is a relatively new Dell PowerEdge and there are 7 PC's all running XP Pro SP3.  There had been no software updates applied to the server in 18 months.  They rely heavily on a SQL based software program named Practice CS from Thomson Reuters.  A week ago, I applied roughly 37 SBS updates updates to bring the server current.  Since applying the updates 1 PC locks up everyday around 5pm.  When I say locks up, I mean all applications running at the time lock up ~ with the exception of Internet Explorer, chich continues with excellent response rates.  Task Managers shows little CPU utilization 0-7%.  No corresponding errors in the event logs for either the PC or the server and other PC's continue to work fine.  There are no scheduled tasks that occur around 5pm.  I am not willing to roll back all of the updates to resolve this problem.  Anybody have any ideas?
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Question by:YCHJim
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by:wantabe2
ID: 23701844
Is this computer wireless or wired??
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by:YCHJim
ID: 23701881
Wired
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by:wantabe2
ID: 23702284
Try running Ethereal (I think it is called wireshark now)

http://www.wireshark.org/

Download it onto a computer that is plugged into the same switch as the server & the problem workstation. Then start running it around 4:30 to see if  you see anything crazy going on on your LAN.

If you don't find anything, try changing the power outlet this unit is plugged into, even if you have to use an extension cord. There could be something on the same power curcuit pulling allot of power or/and the outlet may not be grounded properly.
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by:Donald Stewart
ID: 23702545
Try running CurrPorts on this machine prior/during this lock up and you may be able to spot if anything looks suspicious.
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YCHJim earned 0 total points
ID: 23790667
Ran several different sniffers on both the server and the affected PC neither show anything out of the ordinary.  Worked with vendor to identify a SQL lock that was the culprit.
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by:Donald Stewart
ID: 23795901
You should then accept your last comment as the answer to close out the question.
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