Server 2008 slow network response time (network drops to 0% for a 10-60 seconds)

Hey,

I have about 30 machines (XP and Win 7) writing to a file share on a new Windows Server 2008 machine.

Accessing the file share is nice and fast except on the odd occasion when the initial response from the server is very slow.

You can see on the network monitor a drop in traffic down to 0% then all of a sudden data floods in again. (See screenshot).

Where do I start looking? I have replaced the network cable and changed the port on the switch.

Network performance monitor
mhdiAsked:
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Prashant GirennavarCommented:
Start with WireShark tool and monitor the traffic on the server.

Below link might help you

http://answers.perforce.com/articles/KB_Article/How-to-Use-Wireshark-to-Analyze-Network-Performance

http://www.packetech.com/attachment/WP_Chappell_WiresharkTroubleshooting.pdf

Thanks,

-Prashant Girennavar.
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Pramod UbheCommented:
there are multiple possibilities and local firewall + antivirus are some of them.
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mhdiAuthor Commented:
Thank you. We have since changed the switch and cable, updated NIC drivers and I have started running wireshark.

Firewall is off and there is no AV installed.

Ill keep looking and report back if I find anything worth commenting on.
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Natty GregIn Theory (IT)Commented:
Maybe faulty nIC
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WORKS2011Austin Tech CompanyCommented:
Wireshark will likely be overkill, unless you're experienced what you're sniffing around for my advice use easier built in tools.

My first guess is update the NIC driver on the server it's a single point of failure to all the devices related to this issue. Possibly replace, if you have a second NIC which most servers do switch to this one.

From any two computers on the network run from an elevated command prompt ping-t serverip which will constantly run a ping to the server NIC, watch for the time to increase until it goes completely offline as well reason for two computers it isolates the server NIC. If both pings go offline at the same time you've isolated the server NIC.

If something within the server is causing issues run dcdiag /test:DNS.

Check DNS and DHCP errors in log files, do you have multiple records, etc. Reset both.
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WORKS2011Austin Tech CompanyCommented:
Reset the switch, if its a managed switch check logs. Check firmware as well.
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mhdiAuthor Commented:
Hey All, I believe it was the NIC drivers. The problem seems to be resolved. Thank you.
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