Network downtime every thursady at roughly 10.30

[stuartupton]

We have a rather unusual issue, on a Thursday at roughly 10.30 we start to experience network drops where users lose connection to the server, we have a 2008 server running as DC with a Hyper-V 2003 on it containing our data, after a few minutes it will all start working fine again, then will drop again after a few minutes.

The server is in a managed switch which is showing no network errors, we have checked the event logs of the 2008 and the virtual 2003 and there is nothing showing that would look to have caused the issue.

Does anyone have any ideas on what I could check, we have run a Virus scan on the server and all appears clean but it is giving me a very uneasy feeling.

Thanks in advance for any help

Stu

 

[technome]

Do you have any scheduled tasks run approx 10:30?

Process explorer, start it before the expected issue should occur ....

http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx

Download malwarebytes and run it, check for viruses with more then 1 scanner, also check for root kits.

Does this only happen on Thursday, does it eventually clear up by itself?

Not sure if you do this by a report at the switch but check each port for excessive traffic when this happens.


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[kmcferrin]

we have a 2008 server running as DC with a Hyper-V 2003 on it containing our data,

What on earth does that mean? Are you saying that you have a physical server running Windows 2008 as a DC that is also running Hyper-V, inside of which is a virtual machine running Windows 2003? Or are you saying that you have a 2008 server running Hyper-V that has a VM running 2003 that is your DC?

One thing that I would suggest is that if you are running Hyper-V on a server then you shouldn't run anything else on it besides Hyper-V. So don't take a 2008 machine, make it a DC AND a Hyper-V server. Make it one or the other.

________________________________________
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Certified Quest vWorkspace Administrator

 

[AW78]

do you have trend AV running?

Allen White MCSE,MCSA,MCITP,MCTS,CCA,CCSP,VCP

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[stuartupton]

Thanks for the replies and apologies to kmcferrin if i caused confusion.

aw78, yes, we are running Trend AV (Worry Free Business Security)

kmcferrin, yes you are correct in your first assumption, due to budget limitations we had not choice to do anything other than run everything from the one server and we are only using the 2003 in Hyper-v until our main software provider finishes the 2008 tested version of our back office system.

Thanks again