It sounds more like a firewall issue if you are having trouble accessing the server from outside the network. DNS is really only used to resolve domain names to IP addresses. If you have a static IP on the server, you should be able to access it from outside without even having a DNS server.

You may want to try turning off the firewall temporarily on the router and see if you can access the server.

__________________
Steve Kellam
Ruling Elder
Redeemer ARP Church (Blacksburg, VA)
Husband to Holly and father to Bethany, Susannah, and Charlotte (and one on the way!)
“Prayer is as natural an expression of faith as breathing is of life” -- Jonathan Edwards