error "duplicate name exists on the network"

Discussion in 'Windows Small Business Server' started by associates, May 15, 2006.

  1. associates

    associates Guest


    I was wondering if anyone might be able to help me here. I'm not sure why
    i've been getting this message everytime i started the SBS server machine.
    The message said "Duplicate Name exists on the network". What does it mean?.
    I admit that i have another PC used as a fileserver but it's got a different
    computer name and it's in a workgroup, not domain. At the moment, i've been
    testing to connect my laptop to the server before it's officially used on my

    Thank you in advance
    associates, May 15, 2006
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  2. Do you have 2 network cards in the SBS server with both of them plugged into
    the same switch or router?
    Merv Porter [SBS-MVP], May 15, 2006
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  3. In
    Sounds pretty clear to me!
    Do you have any computers on your network with identical NetBIOS names? Or,
    do you have any computers with two network interfaces (as in, a wireless &
    wired connection, or two wired connections) on at the same time?

    If not, how many NICs in your server - and, is WINS enabled on both? Don't
    do that, if so...
    Lanwench [MVP - Exchange], May 15, 2006
  4. This means that two computers have identical names not necessarily the
    Frank McCallister SBS MVP, May 15, 2006
  5. associates

    associates Guest

    Thank you all for your reply.

    No, i don't think there are two NICs in the SBS server because i haven't
    done anything to it in terms of adding any hardwares. It's still a new
    machine that i bought last week. There is only one point where i can plug in
    my network card in the server's box.

    However, i have a few PCs including this SBS machine connecting to the same
    router. It might detect a duplicate name when trying to connect to the
    network. And i don't use WINS since i have enabled the DHCP on that router.
    So the router is responsible for providing IP address to computers attached
    to it.

    When receiving this message, there is only two PCs connecting to the router.
    The other PCs are not on the network at the time. But then, i checked this PC
    and found that it has a different computer name under control panel -> system.

    For example, the computer name for sbs server is MWH.mwhserver.local and for
    the other pc is fileserver.

    Your help is greatly appreciated.

    Thank you

    associates, May 15, 2006
  6. Double check to make sure you don't have any workstation with the computer
    name: MWH .

    Merv Porter [SBS MVP]
    Merv Porter [SBS-MVP], May 15, 2006
  7. In
    Well, a) that doesn't mean you can't use WINS, b) it doesn't mean that
    NetBIOS name conflicts can't occur and c) it's really a lot better to use
    your SBS box as a DHCP server. But that's neither here nor there.
    I suppose their names could still be remembered. Did you check them all,
    connected or no?

    Are you joining all the computers and servers to the domain ? If you create
    the computer accounts and use http://servername/connectcomputer to join
    them, you'll know for sure that you don't have conflicts, and you'll also
    have everything functioning as it should be.

    Also make sure that you aren't on a hub/switch shared with other
    computers/networks....those would all count, too.
    Lanwench [MVP - Exchange], May 15, 2006
  8. associates

    associates Guest

    This morning, i did another check again because i still can't find other
    computers with the same name. So, i turned off all the computers including
    the sbs and turned on just the sbs machine. Behold, that message still came
    up on the sbs server. Strange

    No, not yet. Because this is my first time using the sbs 2003. Before i can
    replace the old computer served as a file server at the moment with this sbs
    machine, i need to ensure that i know how this sbs server works first. So for
    an experience purpose, i just managed to get one laptop of mine to join to
    the domain and connected to the sbs and that works fine. They both connected
    This, maybe the cause. Some of the PCs including the sbs server are
    connected to the hub due to the limited number of ports on my other router.
    associates, May 16, 2006
  9. In associates <> typed:
    What does that mean, exactly? What other router? What else is connected to
    the hub you're discussing?
    Lanwench [MVP - Exchange], May 16, 2006
  10. associates

    associates Guest

    Basically, this is how my little network looks like. I have a broadband
    modem router (say router A). Then, i have another router that supports VPN
    (called VPN router). The reason for having this VPN router is to let my home
    computers be able to connect to the office to access shared files. Anyway,
    i've got a few PCs connected directly to the router but because there is a
    limited number of ports available in the VPN router. I hooked up the switch
    (not a hub, my apology) to the VPN router so that i can put a few more PCs
    onto the network. These few PCs includes the SBS server machine i just
    bought. In another word, it looks like peer to peer network there because the
    sbs and other PCs all connect to the switch. This is what it looks like at
    the moment.

    Sorry about the confusion i caused. Thank you in advance
    associates, May 17, 2006
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