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Full Discussion: Telnet to port
Operating Systems AIX Telnet to port Post 302386213 by TonyFullerMalv on Monday 11th of January 2010 05:55:35 PM
Old 01-11-2010
Telnetting to a particular port rather than the standard port 23 for telnet can be a useful test to see if something is listening on a port, e.g. to see if a machine is running a SSH daemon on port 22 the you do:
Code:
$ telnet localhost 22
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SSH-2.0-OpenSSH_5.1p1 Debian-6ubuntu2
^]
telnet> quit
Connection closed.
$

Whereas testing to see if my machine (or a remote machine) is serving DNS:
Code:
$ telnet localhost 53
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused
$

in this case the answer is not...
 

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TCPCONNECT(1)						      General Commands Manual						     TCPCONNECT(1)

NAME
tcpconnect - general TCP/IP client SYNOPSIS
tcpconnect [-irv] [-l localaddr] host port DESCRIPTION
tcpconnect creates a TCP/IP connection to a server running on the machine host, listening to port port. It then reads standard input and sends to the remote server, and data received from the server is printed to standard output. When end-of-file is reached on both standard input and the TCP/IP connection, tcpconnect terminates. OPTIONS
-i Terminate at end-of-file on standard input; don't wait for the server to close the connection. -r Terminate when the remote server closes the connection; don't wait for end-of-file on standard input. -v Verbose mode. Prints a message to standard error when the connection has been established. -l addr:port Bind the local end-point of the connection to IP address addr, TCP port port. Either the IP address or the port, but not both, may be left out, meaning that the operating system gets to choose that part by itself. SEE ALSO
tcplisten(1), telnet(1), tcpbug(1). BUGS
The names of the options are not yet finalized, and may change at a future release. 1997 April 13 TCPCONNECT(1)
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