ixamit, il firewall non centra nulla...
Io non conosco windows e non conosco iss ma leggendo dalle faq il problema potrebbe essere anche il firewall in modalità proxy...
[1.7] I get the "Server cannot be runned : another server use the requested port" error.
If you're on 2K or XP, try running servers as services. If error still appear, configure all your applications so that none use port 80 (used by Apache) nor 3306 (used by MySql).
To know which application uses one of those ports, scan your computer with TCPView.
(Usual applications that may be using port 80 (http) are, between others, Kazaa Lite,
Norton Firewall (proxy function), IIS (under XP Pro), Yahoo Messenger, Internet Security).