Can their computers access the server at all? Test with "ping".
Are their browser requests reaching the server? Test by checking the access log on the server. For example, you can tail the access log (tail -f /web/service0/log/access.log), look at the last line, then go make a request from another computer, then look at the last line again. If it didn't change, they aren't reaching the server.
Is there a firewall in the way? Is there a firewall on the server that blocks remote access?
Now the question is, when people on the network are trying to access my server/page, what is the address they are going to browse to? I know it is something like
"http://*****:8000/" right? But what goes in the "******", is it the hostname, the server or the servername?
To find out your ip address, use "ipconfig" on the unix shell. To find our your hostname, use "hostname" on the unix shell.
Use ifconfig for Linux/Unix. It usually sits in /sbin/ which usually is not in your PATH. So you may have to call it by invoking /sbin/ifconfig.
There are lots of old posts about firewalls and stuff, try searching in the Forums. In fact yes, this thread from June says Red Hat 8.0 uses a firewall called "lokkit", so that's probably your problem.