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Thread: Slow network connectivity between SBS 2003 and Server 2008

  1. #1
    Daniel Havlín Guest

    Slow network connectivity between SBS 2003 and Server 2008

    1/ SBS 2003, Pentium D 3.0 Ghz, 2GB RAM, discs SATA on interated ICH8
    as RAID 5 controller, LAN Intel 82566DC Gigabit Ethernet, Primary AD
    2/ Server 2008, Dual Xeon E5420 2.5GHz, 8GB RAM, discs SAS on MegaSR
    integrated controller of mainboard (Intel S5000PSL) as RAID5, Intel PRO/1000
    EB Gigabit Ethernet, Secondary AD Controller

    Copy of data from the SBS2003 to the Server 2008 is really very slow. In
    average 7000-8000 kb/s (sometimes only 1000-2000 ks/s). Copying in oposite
    direction from the Server 2008 to the SBS 2003 works normally 35000-45000

    It looks like the problem could be on the SBS2003 LAN card (and it's
    upload). BUT if I copy whatever from the SBS2003 to any workstation in the
    same network, everything works normally at speed about 25000-40000 kb/s
    (depends on hw of workstation). The same if I copy something to the Server
    2008 from any workstation in the network, it goes on speed 25000-40000 kb/s.
    So the problem is ONLY if I copy something from the SBS2003 to Server 2008.

    Could anybody help me how to solve this problem?

    Thank you very much!
    Daniel HavlÃ*n

  2. #2
    Robert L. \(MS-MVP\) Guest
    For a test, try to disable auto tuning. This search result may help.
    Vista Slow Issues
    Vista Slow Issues. Some solutions for slow copy. 1. Disable the
    automatic adjustment (Auto Tuning) for the TCP window size on the network.

    I did try this on Server 2008 side - no recognisable result, still the same behaviour :(

  3. #3
    Justin King-Lacroix Guest

    Slow network connectivity between XP and Server 2008

    I'm having the same problem between XP clients and a 2008 server. Server->client is as fast as it should be; client->server is about one-tenth the speed. Have fiddled with autotuning, receive-side scaling, ethernet card interrupt moderation, to no avail.
    Client->2003 server is at normal speed.

  4. #4
    Join Date
    Jun 2009

    Re: Slow network connectivity between SBS 2003 and Server 2008

    I have the same issues between a 2003 R2 File Server & all my 2008 Servers. I see this issue on a vista boxt to the 2003R2 File Server also. Any advise or fix would be appreciated. Thanks,

  5. #5
    Ace Fekay [Microsoft Certified Trainer] Guest

    Re: Slow network connectivity between SBS 2003 and Server 2008

    Unfortunately, replying to a post in Techarena that is older than 90 days,
    doesn't allow us in the actual Microsoft newsgroups to see the original post
    that you are replying to. <ost of the posts that you see in Techarena come
    from the Microsoft newsgroups.

    It would have helped us to better help you. If you made a new post with your
    problem with an explanation of what's going on, it would have been better.

    Based on the limited information and the subject line, I would suggest to
    disable the RSS TCP Chimney values in the reg on both the 2003 and 2008 box,
    as well as disable IPv6 in the registry on the 2008 server.

    Info on the TCP Chimney feature...
    ==================================================================================================== ==
    ==================================================================================================== ==
    Slow file transfer and connectivity with Windows 2003 SP2, Windows 2008, SBS
    2003 SP2 and SBS 2008, and Vista
    System Error 64
    System Error 53
    Shares disconnect after a server has been running for a period of time such
    as a couple of weeks and a restart fixes it temporarily.

    This may be due to the new RSS TCP Chimney Offload feature enabled on 2003
    SP2 and newer servers.

    TCP Chimney Offload overview:

    TCP Chimney Offload is a networking technology that helps transfer the
    workload from the CPU to a network adapter during network data transfer. In
    Windows Server 2008, TCP Chimney Offload enables the Windows networking
    subsystem to offload the processing of a TCP/IP connection to a network
    adapter that includes special support for TCP/IP offload processing.

    TCP Chimney Offload is available in all versions of Windows Server 2008 and
    Windows Vista. Both TCP/IPv4 connections and TCP/IPv6 connections can be
    offloaded if the network adapter supports this feature.

    Two ways to handle it.
    1. Disable RSS using the netsh command (preferred)
    2. Disable RSS in the registry

    1. Disable RSS using the netsh command:

    netsh interface tcp set global rss=disabled
    netsh interface tcp set global autotuninglevel=disabled
    Reboot the server

    2. Disable RSS in the Registry

    Add a DWORD registry key value for
    and setting it to 0. A reboot is required to make the value go in to
    Set DisableTaskOffload in the Registry
    Use the steps in KB 904946 to create a DWORD value for
    and set it to 1.
    A reboot is required to make this value go in to effect.

    More info on the subject...

    Information about the TCP Chimney Offload, Receive Side Scaling, and Network
    Direct Memory Access features in Windows Server 2008

    You cannot host TCP connections when Receive Side Scaling is enabled in
    Windows Server 2003 with Service Pack 2

    Vista slow after SP2 installed on Windows 2003 Server (SBS or non-SBS) or
    using Windows 2008?

    Windows 2003 service pack 2 known issues on Small Business Server 2003

    Susan Bradley: Vista slow after SP2 installed?

    You experience intermittent communication failure between computers that are
    running Windows XP or Windows Server 2003

    Common Networking Issues After Applying Windows Server 2003 SP2 on SBS:

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