Adding port and port scan

Question

Hello,
I want to open a port (say 4010). Below is what I try...
I go to System Preferences->Sharing->Firewall, and click New.
Then I select PortName: Other, TCP Port Numer: 4010, UDP Port Numer: 4010, description: MyNewPort.
I see that MyNewPort is checked and that the Firewall is On.
I then open Network Utility, click on Port Scan tab, and scan 127.0.0.1 for ports between 4000 and 4020.
It reports:
Port Scan has started...
Port Scanning host: 127.0.0.1
Port Scan has complee...
(it doesn't find 4010). Why? What's going on?
help is welcome,
Kamel

Answer 1

well, what I've done is try to open a telnet session on port 4010 of localhost.
I gave the error message resulting from this in my previous post.
the program I mentioned that listens to port 4010 can actually be told to listen to any port. I want to check that it does in fact work by sending info to a port using telnet. As of now, I'm stuck at the point of getting telnet to send to the port.
I think telnet fails because the port is NOT in fact open--since this is what is shown by the Network Utility port scan. But as described earlier, I've set it open in System Prefereneces->...->Firewall, and also in my router administration page.