Telnet

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Related to Port 23: putty, Port 53, Port 22, Port 443

TELNET

[′tel‚net]

(communications)

TELNET

/tel'net/ 1. The Internet standard protocol for remote login. Runs on top of TCP/IP. Defined in STD 8, RFC 854 and extended with options by many other RFCs. Unix BSD networking software includes a program, telnet, which uses the protocol and acts as a terminal emulator for the remote login session. Sometimes abbreviated to TN. TOPS-10 had a similar program called IMPCOM.

2. The US nationwide network into which one dials to access CompuServe. It was created by John Goltz, one of the founders and system guru of CompuServe. He later worked for Tymshare, one of CompuServe's big competitors.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

Telnet

A terminal emulation protocol used on the Internet and TCP/IP-based networks. A Telnet program allows a user at a terminal or PC to log in to a remote computer and run a program and execute other Unix commands. Originally developed for ARPAnet, Telnet is a common utility in the TCP/IP protocol suite, but it is not secure and transfers commands in the clear. Secure shell (SSH) provides an encrypted alternative that is widely used (see SSH). See also Telenet.

Telnetting from Windows

The Telnet utility in Windows is used to log in to and run programs on servers in local networks as well as the Internet. In this example, Telnet is used for local device management. It is logged into a router to run the device's built-in configuration software.

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References in periodicals archive ?

The function initialHandler() handles all connections received on TCP port 23. In particular, depending on the first bytes received from the connection, it distinguishes between bot and admin/user clients (Listing 2).

The most relevant one is Handle() which is invoked from main() each time a new admin/user connection is established on port 23 of the CNC Server.

As far as we know, this is only a faster way to schedule a new attack that does not require a complete login procedure and a full command line interaction, as the interface on TCP port 23 does.

The most relevant one is the Handle() function that is invoked from main() each time a new bot connection is established on port 23 of the CNC Server.

In particular, it kills telnet (port 23), SSH (port 22), and HTTP (port 80) services by invoking killer_kill_by_port() for each port number.