SP2 that's probably why! Any reason why you updated or were you just following the other sheep. Sorry for the poor joke! SP2 has caused problems for people worldwide & cost amny business dollars by those who have been affected. SP2 limits port access & reverts firewall settings back to default.
Might be wise to check these out:
Point A & also
point B
Also have a close look at htis thread about updating your winshield installers:
http://www.gnutellaforums.com/showth...threadid=29039 (Particularly the 3rd post.)