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

Posted on 2014-08-03
Last Modified: 2014-08-10

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
Question by:mhdi
    LVL 10

    Accepted Solution

    Start with WireShark tool and monitor the traffic on the server.

    Below link might help you


    -Prashant Girennavar.
    LVL 10

    Assisted Solution

    by:Pramod Ubhe
    there are multiple possibilities and local firewall + antivirus are some of them.

    Author Comment

    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.
    LVL 9

    Assisted Solution

    Maybe faulty nIC
    LVL 17

    Assisted Solution

    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.
    LVL 17

    Assisted Solution

    Reset the switch, if its a managed switch check logs. Check firmware as well.

    Author Comment

    Hey All, I believe it was the NIC drivers. The problem seems to be resolved. Thank you.

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