The Secure Shell Connection Protocol
RFC 4254, “The Secure Shell Connection Protocol”, is a Proposed Standard document published in January 2006 by T. Ylonen, C. Lonvick. It has since been updated by RFC 8308. The canonical text is published by the RFC Editor.
Abstract
Secure Shell (SSH) is a protocol for secure remote login and other secure network services over an insecure network.
This document describes the SSH Connection Protocol. It provides interactive login sessions, remote execution of commands, forwarded TCP/IP connections, and forwarded X11 connections. All of these channels are multiplexed into a single encrypted tunnel.
The SSH Connection Protocol has been designed to run on top of the SSH transport layer and user authentication protocols. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 4254 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 4253 The Secure Shell Transport Layer Protocol
- RFC 4255 Using DNS to Securely Publish Secure Shell Key Fingerprints
- RFC 4252 The Secure Shell Authentication Protocol
- RFC 4256 Generic Message Exchange Authentication for the Secure Shell Protocol
- RFC 4251 The Secure Shell Protocol Architecture
- RFC 4250 The Secure Shell Protocol Assigned Numbers
- RFC 4249 Implementer-Friendly Specification of Message and MIME-Part Header Fields and Field Components
- RFC 4246 International Standard Audiovisual Number URN Definition