Apache 2.2 configuration

I'm either going mad, or something isn't quite working properly.
I have a 2008 server in my firewall DMZ with a public ip. I had iis7 working and accessible on the servers public ip and hostname.

I've installed apache 2.2 onto this server and no amount of configuration of listen or servername will get it to respond to a remote machine. It will respond when the ip or hostname is accessed locally.

I have Allow from all on the documentroot, and nothing shows in access.log.

Anybody got any clues?

Matt

Bump..

Windows Firewall? (Likely IIS would have exceptions, moreso than Apache).

It's off while i'm testing it, but thank you anyway.

Matt