Web pages not accessible ( timeout)

I am at a complete loss with a problem that I am having with a server that I want to use as a web server, and I am hoping that someone may have some ideas on what is going on.
I have 5 Xserves doing various things however the one that I need to use as a web server is giving me grief.
Background: Servers are behind a University firewall. Web Server is Xserve G5 running 10.4.11, other services running on this machine are DNS, OD, NetBoot, and File Sharing. URL http://commarts.uws.edu.au
The problem that I have is that web pages are timing out and are not visible from the web (external to the university) but they work fine via the local network. The first thing that I thought of was obviously the universities firewall but I have been assured that port 80 is open for all of these servers. I have confirmed this by doing a port scan from home on each one. Interestingly all servers do have port 80 open but only one is actually accessible from the web when the service is turned on. All others just time out when they are accessed.
I have thought that this could be a DNS issue but the server that IS accessible from the web is getting its name from the DNS server, which is the one that I want to be seen, so at a guess this should count out DNS? Is it possible that it could be an external DNS issue???
The only other thing that I can think of is that there is something wrong with the web configuration but I really don't know where to start looking at that.
Does anyone have any other ideas about what may be going? This is something that I really need to sort out.
Best regards,
Darren

Do you have multiple sites on that server? If yes. make sure none of them has performance cache enabled.
Failing that, check if it works from other subnets inside your university networks, not just your local network.
Also, check if you are using OS X Server's firewall. If yes, make sure it allows traffic to port 80 from any address.

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