Network slows down at 5 for 20 minutes

I've having a strange problem. At 5 pm everyday all my PC's slow down to a crawl for 10 to 20 minutes. Then they come back fine. The only thingk I can think is something is running on the network at that time. Outlook keeps giving the connecting to server error, internet takes for ever for things to come up... etc

I don't have any processes running then that I can find unless the guy before me hide something somewhere. Auto updates go at midnight, sql tasks run after midnight backups start at 7.

I was thinking of setting up a snort server or something liek that to view the traffic to see if I can pin point whats going on? I this a good idea or is there a better way to trap and evaluate the traffic? I have a mix of managed and unmanaged switches.
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t1clausenAsked:
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papimichelCommented:
Usually its an anti-virus program that is configured to run once a day, ni your case its 5pm.

ask your sys admin about this issue.. he might give you more specific answer :)

Yours,
Michel.
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t1clausenAuthor Commented:
I hate to admit it but I'm the System admin :-)
I don't think I have any of the Anti Virus programs to go at 5 but I'll double check them all and make sure.
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grsteedCommented:
Check to see if there are any backups set to run at that time.  Is the traffic just on the local subnet/network or is Internet traffic?  A check of the router interface at that time would tell.  Perhaps it's a broadcast storm being initiated at that time.

If you have a Windows Server 2003, you could use Network Monitor to trap data. It can be installed from Add/Remove Programs > Windows Components > Management and Monitoring (I think that's where it is).

You could also use Ethereal (www.ethereal.com) to trap the data.

On the managed switches, can you get any port stats?
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t1clausenAuthor Commented:
Looks like the problem is most likely McAfee. I just got looking and by default the updates run at 5pm plus or minus an hour. I just downloaded the protection pilot and I'm trying to set the update time to 11:30 PM, of course most of the PC's are off then so maybe I should set it for noon....
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