Well we won't be able to help you if you don't tell us how it's set up...
We need to have at least some idea of what a packet of data has to pass on its merry way to and from your server to and from the clients...
So what IPs are you using on the server, how is the server itself configured, how is the router passing the packets needed (NAT config would be really nice to see), etc, etc..
You may want to scan anything you post here for passwords, so we don't get to see those, and you may change your external IP address to something else so we won't instantly know where to send spam mails, or virii (not that we'd do that, but this is still a public website). If you change the IP address, make sure you change it to the same one everywhere, or else we'll be yelling a lot of false positive errors in your configs
If any of this did not make perfect sense... Just say so.