Thanks Mart, yeah, found similar links, but just hit the nail i think - it's related to my test-server at home running 2k3.. just started thinking about returning it to work instead ;P (all that has been doing is creating problems).

http://www.derkeiler.com/Newsgroups/alt.computer.security/2004-11/0284.html seems to confirm my suspicion, seems to be something about having a fixed lease..

No, I don't have any wlan up and running just due to the fact that it's to easy to break into (and I don't know the ppl living in the area around me...).
So, yeah. It's some MS-magic.

Thanks again for the help Mart.
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as long as it works - why fix it?
If it doesn't work - kix-it!