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    Known Issue: After applying KB 953230 WDS stops working
    Jez Sadler - MS
    On  7/8/2008, a security patch was released for DNS by Microsoft and other DNS server vendors. The Microsoft patch was tracked as KB953230 - the documentation on it is here.

    As part of the patch, DNS now reserves 2500 UDP ports - including the ports from 64000 to 65000 that WDS uses by default. Because of this, if DNS and WDS are running on the same server, WDS cannot access those ports and so is unable to perform TFTP (required for PXE boot) or Multicast.

    To work around this, open the WDS MMC, select your server, and go to Server Properties from the right-click menu or the Action menu. Then on the Network Settings page, set a different range of UDP ports. The best range to choose will depend on what else you are running on your server - you want to pick ports that other server roles and applications are not using. The dynamically allocated ports start from 49152, so your Start port should be at least that.