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Server disconnecting from the Network

We have a very strange problem with one of our customers networks. We are running Small Business Server 2003. Which is connected to a Gigabyte switch. All workstations are connected to the same switch.

The users have email and network drives mapped. One program that accesses a network DB is called Estimation.

The problem we have is most days normally around 5/5.30 the server will loose all network connectivity for around 15/20 seconds.

There is nothing in the event logs around the time it drops out. We only found this out by running a ping command to four different devices on the network and outputting to a log file.

At first we thought it was the switch but all other workstations can ping each other and the internet so not the switch as such.

This wouldn't be a problem but the software we use called estimation cannot handle the dropouts. We then have to task manager the program and start again.

As i said this normally happens around 5/5.30 but sometimes it does happen during the day.

Were not really sure where to go with this now.
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purpleoak
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purpleoak
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1 Solution
 
Rob WilliamsCommented:
Are there any scheduled tasks for that time?  Shadow copies, AV scans, backups, updates applied or checked?  Shadow Copies would be my first thought where it is a short period of time.

To check or change:
http://technet.microsoft.com/en-us/library/cc786104(v=ws.10).aspx
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purpleoakAuthor Commented:
I logged on and checked the shadow copy option this runs at 7AM and 12PM every day. Not at 5PM when the dropouts finishes.

why would this cause the network to drop? we have shadow copy running on dozens of other servers for different clients and it's never been a problem that i'm aware of.

Thanks for your help so far.
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Rob WilliamsCommented:
Obviously shadow copy is not the problem based on your trimming but in order for shadow copy to access open files it has to lock them for a brief second.  You mentioned your application was very sensitive to disconnects so I was suspecting it might be the problem.
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purpleoakAuthor Commented:
Was to do with a network card in the end. Teaming was enabled and it kicked off a service at this time.
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