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Network dropping same time every week

Posted on 2014-03-19
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Last Modified: 2014-04-01
Hi Experts,
For some reason every Wednesday at exactly 3:03 our network drops for about 5 seconds. Just long enough to lose connectivity and our database to drop. One interesting thing is daylight savings has affected the time of the drop, it was 2:03 before.

I have checked the event logs on the domain controller and a that time there is an event 27. Intel(R) Gigabit ET Dual Port Server Adapter Network link has been disconnected.

The event logged at the exact same time on a staff computer is Event 7040 The start type of the Windows Modules Installer service was changed from demand start to auto start.

Any and all ideas are appreciated.
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Question by:nicolausj
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Expert Comment

by:piattnd
ID: 39940771
Definitely sounds like something running on a schedule then.  Check scheduled tasks and make sure there's nothing running.  Turn off auto updates on the server.  If the problem still persists, turn off all unnecessary services.  If possible, turn off all non Microsoft services from within MSCONFIG and see if the problem still continues.  

Do you see this behavior from any other servers?
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Author Comment

by:nicolausj
ID: 39940788
Yes, I just checked or other domain controller and the network card seems to drop at the same time as well.
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Assisted Solution

by:piattnd
piattnd earned 1000 total points
ID: 39940793
Are they plugged into the same switch?  Are there any installer events around the same time on each server?  Do you have auto updates running at that time/day?
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LVL 10

Expert Comment

by:Schuyler Dorsey
ID: 39940796
A couple things to check..

1. Go on the server to the Driver Mgmt page and go to the properties of the NIC. Under the power mgmt tab, make sure the option "allow this computer to turn off this device to save power" is UNCHECKED.

2. Check your scheduled tasks. Do you have a weakly backup running at that time?

3. Is this a virtual or physical environment. I often see this behavior when it is a virtual environment and the ISCSI or NFS traffic was not segmented from the main data traffic.
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LVL 3

Author Comment

by:nicolausj
ID: 39942323
piattnd, they appear to be on the same switch a 3com 4210.

Schuyler Dorsey, Power save is turned off. All of our backups run between 9pm and 3 am depending on the server and I double checked all of our scheduled tasks an nothing is specifically running wednesdays at 3 or 2. These are not virtual servers but dell boxes.
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Accepted Solution

by:
nicolausj earned 0 total points
ID: 39942370
I just logged into the switch and the uptime and all the stats for it aren't loading correctly. I might try rebooting it this weekend and see if that helps.

Any other suggestions are still welcome. And I will investigate.
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LVL 10

Assisted Solution

by:Schuyler Dorsey
Schuyler Dorsey earned 1000 total points
ID: 39942380
If you are going to reboot the switch anyway.. I would reboot it and see if it comes up fine. If it does, I would try upgrading the firmware to the latest version.
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Author Comment

by:nicolausj
ID: 39942532
I was thinking the same thing.
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Author Closing Comment

by:nicolausj
ID: 39968795
The reboot seemed to work and nothing happened wednesday afternoon.

Thanks for the help.
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