> 
> I have found that the default maximum number of telnet ports is 3. if i try
> to connect more than 3 telnet clients, i get the message "telnetd: All
> network ports in use." on the client, and then it closes the connection.
> 
> how do i change the number of network ports, so that I can have more telnet
> connections to my computer?

Make more pty's. See:
http://www.macbsd.com/macbsd/macbsd-docs/faq/faq-6.html#ss6.12

Take care,

Bill