Internet Technologies/Telnet

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Telnet is a protocol designed to remotely access computers in a client-server fashion. Telnet is inherently insecure, as the data passed from the client to the server or vice-versa is not encrypted. For connections through insecure networks (such as the Internet), SSH (Secured SHell), should be used so all communications between the client and server are encrypted.


Test if the HTTP port is open and its service listening[edit]

telnet localhost 80

Send an email[edit]

telnet localhost 25
Connected to localhost.localdomain.
Escape character is '^]'.
mail from:<>
250 2.1.0 <>... Sender ok
rcpt to:<>
250 2.1.5 <>... Recipient ok
354 Enter mail, end with "." on a line by itself
Let's meet
250 2.0.0 n514OvkN019941 Message accepted for delivery
221 2.0.0 closing connection
Connection closed by foreign host.