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Telnet is a client-server protocol, based on a reliable connection-oriented transport. Typically, this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23, where a Telnet server application (telnetd) is listening. Telnet, however, predates TCP/IP and was originally run over Network Control Program (NCP) protocols.
up vote 354 down vote accepted. Assuming that it's a TCP (rather than UDP) port that you're trying to use: On the server itself, use netstat-an to check to see which ports are listening. From outside, just telnet host port (or telnet host:port on Unix systems) to see if the connection is refused, accepted, or timeouts.