High Quality Content by WIKIPEDIA articles! The TCP Port Service Multiplexer (TCPMUX) is a little-used Internet protocol defined in RFC 1078. The specification describes a multiplexing service that may be accessed with a network protocol to contact any one of a number of available TCP services of a host on a single, well-known port number.A host may connect to a server that supports the TCPMUX protocol on TCP port 1. The host then sends a name of the service required, followed by a pair of carriage return and line feed characters (CRLF). The server replies with a '+' or '-' character and an optional message, followed by CRLF. In case of a positive reply ('+'), the protocol or service requested is started, otherwise the connection is closed.

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