MAC address blocked in domain.

Discussion in 'Server Networking' started by Vulcan County, Sep 25, 2007.

  1. I have a few laptops that are connected to my domain. If I take one on the
    raod and connect to another network all is fine until I bring it back to my
    network and it fails to connect. DHCP works but once it has an address it
    will not receive data. Wireless connection woul still work but wired
    connection fails.

    Work Around: Change the MAC address and disable/enagble and it connects just

    Is there any reason that the MAC address would not be allowed to connect to
    a domain? No filters or wireless problems. Could the computer account in AD
    be corrupted?
    Vulcan County, Sep 25, 2007
    1. Advertisements

  2. Hello,

    does it work if you reboot the laptop ?
    what does display ipconfig /all ?
    Does it appear if you do not activate the wifi, but just connect on another
    ethernet network ?

    Any wifi tool installed ?
    Network card order may be changed when activating the wifi
    Mathieu CHATEAU, Sep 25, 2007
    1. Advertisements

  3. Reboot does not do anything except get an IP address if set to DHCP or even
    if you reserve by mac address so DHCP does work. Ipconfig /all shows all of
    the proper information for DNS. IP, Gateway etc but release and renew will
    not work unless you reboot ot disable/enable the NIC.

    WiFi will not work at all if NIC is enabled but works fine if the NIC is
    disabled. Once I change the NIC's MAC address everything works great. I can
    take it home and plug it in and the NIC and wireless work just fine.

    WiFi disabled and nothing works. No tools installed that have helped and how
    can I tell if there is a network card order?

    It all narrows down to the MAC on our Domain.
    Vulcan County, Sep 25, 2007
  4. Think about it.
    Only under special circumstances does the laptop not connect. How could
    that be a AD error or corruption?

    Same circumstances point to a local to the laptop issue not your network.

    Are you doing dhcp reservations? if not, mac has nothing to do with it.
    after all you would let any mac connect right?

    Not to ask a dumb question but did you check out/disable the firewall
    settings? Perhaps the user clicked trust local network when connected at a
    hotel in answer to the firewall question. And now on a different ip subnet
    the firewall is blocking. Change the mac and the firewall sees this as a
    whole new connection.
    Joshua Bolton, Sep 26, 2007
  5. In
    What operating system is the laptop running?
    What other software is installed on the laptop? Are there any wireless
    config tool, or any other 3rd party non-Windows tools installed such as a
    3rd party firewall, etc?

    If Vista, the NIC will fall asleep and get disabled if not being used. It
    will come back up if you plug the laptop in. I've seen this before.


    This posting is provided "AS-IS" with no warranties or guarantees and
    confers no rights.

    Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT,
    MVP Microsoft MVP - Directory Services
    Microsoft Certified Trainer

    Infinite Diversities in Infinite Combinations

    Having difficulty reading or finding responses to your post?
    Try using Outlook Express or any other newsreader, configure a news
    account, and point it to Anonymous access. It's
    easy and it's free:

    How to Configure OEx for Internet News

    "Life isn't like a box of chocolates or a bowl of cherries or
    peaches... Life is more like a jar of jalapenos. What you do today
    may burn your butt tomorrow." - Garfield
    Ace Fekay [MVP], Sep 26, 2007
  6. Mathieu CHATEAU, Sep 26, 2007
  7. I was thinking if the laptop was removed incorrectly from the domain or
    removed for a long time that it would think that the account already exists
    and would not let it re-connect or re-authenticate.
    Vulcan County, Sep 26, 2007
  8. Updates:

    DHCP works for any MAC address assigned to the laptop through DHCP or
    reservation. Once the address is assigned it stop receiveing with no other

    Currently I am running Windows XP pro. no firewall or antivirus installed.
    No third party wireless programs installed either.

    The laptop is always powered or on a docking station. Either way it still

    If AD is not failing the what else in the Server or Workstation would block
    based on MAC address alone.
    Vulcan County, Sep 26, 2007
  9. Vulcan County

    Anthony Guest

    Is it possible that someone has tried to set up network access control or
    MAC assignment on the switch?
    Anthony, Sep 26, 2007
  10. WOW, Never thought of that one. Didn't even know I had a setup on that.

    Static MAC address set to specific ports on an old 3COM com switch. Remove
    static setting and reset MAC on laptop and it connected.

    Thanks for the tip.
    Vulcan County, Sep 26, 2007
  11. Vulcan County

    Anthony Guest

    Anthony, Sep 26, 2007
  12. In
    Yep. You can disable this action in Device Manager in the properties of the

    Ace Fekay [MVP], Sep 26, 2007
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.