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In my MS-2003 sp-2 machine DNS.EXE opens all ports for UDP traffic all ports 49152 til 56535 are active listening for UDP-traffic
System therefor slows down
This is a security enhancement. You can edit the settings.
See http://technet.microsoft.com/en-us/library/ee683907(WS.10).aspx and http://support.microsoft.com/default.aspx/kb/956188?p=1
-Greg