Losing Connection to Server – Why?

15 pts.
Tags:
Hyper-V
Network connectivity
Switches
Windows Server 2008
Hi there, I'm just looking for some suggestions of possible causes for losing connection to our server periodically. We just brought our whole IT infrastructure in house about 6 months ago. From day one we've been losing connection to the server (ie. our offline files folder kicks in, lose connection to Exchange, can't access network folders) around the same time every day. Between 11am and 12pm. We have replaced the switches, assuming first they were the issue, and we were okay for about a week, but then started to experience the same problem. Next we analyzed what is happening between 11am and 12pm on the network, the only things are a few scheduled tasks for back ups. We've stopped the scheduled tasks for now, but still are being disconnected. I'd appreciate any thoughts as to possible culprits... Thanks!

Software/Hardware used:
HyperV, Server 2008, XP, Cisco, 3com

Answer Wiki

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I would suggest putting <a href=”http://www.wireshark.org”>Wireshark</a> on a machine having this disconnect problem and start capturing traffic before the problem window and just after the problem window. Take a look at the traffic specifically things like DHCP renewals; server connection RSTs or FINs. Look at other broadcast traffic on the network and see if any unexpected patterns or saturation.

You also have the tag Hyper-V on your question, could any of the devices be going into power-save or hibernate mode?

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  • Cristal3na
    [...] Read more from the original source: Losing Connection to Server - Why? [...]
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  • Cristal3na
    I will give this a try as well as investigate the power-save/hibernation mode possibility , thanks very much!
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  • jinteik
    it will be great if your servers are put with static IP if you have a dhcp server.. do check out how often is your server renewing all IP's too.. another way is if you have monitoring tools, install snmp on the servers and switches and let the monitoring too do the checking of availability..
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  • OwenAmbrose
    We use Trend Business Security on all the networks we manage and one which is running Windows Server 2008 was having similar problems, losing connectivity at certain times. It turned out it was the Trend TDI Driver that was causing the problem, we instaleld a HotFix which seemed to fix it. Your problem might be something similiar maybe you should have a look at what software you run that could interfer with the network.
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