Intermittent connection issues to server

Posted on 2014-08-07
Last Modified: 2014-08-26
I have an odd issue happening and I am looking for some help for it. We have a server on our LAN that we use as a load balancer for RDP connections to several other servers. The load balancing software is from X2 and the server itself is Windows 2003 Std SP2. Many users go through this one server to reach our RDP servers and everything works well for it. Our Wireless users on the other hand have big issues connecting to the server. The wireless users are going through a SonicPoint access point connected to a Sonicwall NSA 2400. The SonicPoints are bridged to the LAN and wireless users on the wireless network get DHCP and DNS entries correctly, can ping everything on the network except this one load balancing server. If I choose to do a continuous ping from the laptops, eventually the server will start responding.

I have contacted Sonicwall Support and they state the issue is my server. I have run a wireshark packet capture and sure enough my server is not responding to the pings only from the wireless laptops.

Things I've tried:
1. Ipconfig /release & /renew /flushdns
2. Re-provisioned the SonicPoint profiles for the access points
3. Applied Windows updates to the affected server and rebooted it
4. Swapped SonicPoint units & a switch used for the wireless network

I also want to point out that the load balancing server is a Hyper-V 2008 guest server. I use 1 physical network card per guest and have other network cards I can try which is what I plan to do next.

If anyone has any ideas about this issue or has seen it and resolved it in the past please let me know. It's starting to eat up my days! - Thanks.
Question by:GileadIT
    LVL 18

    Expert Comment

    Run a tracert from the wireless computers to the server.

    Are the wireless clients on the same lab as the wired ones?
    LVL 1

    Author Comment

    When I perform a tracert I get no response. The wireless network is on the same LAN as the wired network but they are in 2 different zones - WLAN & LAN, they are bridged (X2 to XO) on the Sonicwall NSA 2400.
    LVL 18

    Expert Comment

    No response? Not even to the gateway?
    That's interesting.
    Please check the wireless devices if they have a gateway address configured.

    Please post the result if you can
    LVL 1

    Accepted Solution

    This turned out to be a network card issue on the Hyper-V host. The answer came to light when another vm machine stopped responding on the network. When I looked closer, the new vm that wasn't responding was using the same network card as the original vm server that was having issues. I swapped out the cards and everything is working great now.
    LVL 1

    Author Closing Comment

    My solution is what worked for me.
    LVL 18

    Expert Comment

    No worries. glad you caught it.

    I was very surprised when you mentioned there was no response even to the gateway. The next step from my last post would have been to check your hardware drivers and eventually the hardware. One simple test is to ping and also ping the device's own IP address.

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