Can’t see front localhost from other networked pc’s

I’ve got 5 pc’s on the same network. The main pc (let’s call it Server) has IIS on it and I can see the local website i built from there, but when i try from any other pc (trying http://server) it doesn’t show up, even though i can ping the machine, etc.
Any ideas?
Never Mind, solution was darn windows firewall was turned on, blocking port 80!!