Telnet Telnet is a network protocol established in 1974, which is based on a character-oriented data exchange via a TCP connection. It is represented on all common operating systems and therefore also enables the exchange between different operating systems. Safe access to another PC with Telnet The Telnet client establishes an unencrypted connection to a remote computer. An encrypted connection can be established using SSH. This allows opening a command line on a remote computer. Before the connection can be established, the user is prompted for a username and password combination. The password is then passed during the connection establishment. If the data allows access, the Telnet protocol can be initiated. Once a connection is established between the Telnet client and Telnet server, text-based input is transmitted. The remote computer then sends back output from a program in text form. Today, Telnet is primarily used for connection testing due to security vulnerabilities. However, Telnet is still used for database queries and remote configuration. All terms in Expert Know-how