Whats Ports Do I Need?

I'm setting up my server's firewall and I'd like to know what ports I need for the following services: The Server Admin app itself It has many listings in the firewall service list (this is on Leopard Server BTW). I'm not sure which one is actually for the 10.5 server/server admin combo, and which are for older versions that I don't need. I tried playing around and I ended up locking myself out of the server all together. L2TP VPN Service It also has a port listing in the firewall services list. But when I open it, I am still unable to connect to the server's VPN unless I shut down the VPN. There must be some other port somewhere that this service needs. DNS Before DNS was just 53. But leopard's server admin firewall service list has two different listings for port 53. One for DNS inbound queries, and one for DNS responses to outbound queries. Can someone spell out exactly what this means, so I know I understand them. Remote Desktop 3 I'm using remote desktop 3.2, and I'd like to map it's port(s), but not all the other ports I don't need. ARD3 isn't listed in the services list, but ARD1.2 and 2.x are. Is it the same as ARD 2.x? Actually ARD2.x has about 3 different entries, not sure what they all are. I think thats it. Thanks.