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SSH (Secure Shell)

Secure Shell or SSH is a network protocol allowing secure network communications between two computers, by utilising encryption.

SSH is used primarily for:

  • Secure login to a remote server shell, allowing command execution on the server, or access to SCP or SFTP
  • Port-forwarding, allowing a computer to connect to services which are behind a firewall, via the SSH server

SSH uses TCP port 22 by default.

Software

  • OpenSSH - Opensource implementation of the SSH protocol. OpenSSH is the most commonly used server software for SSH, and most common client software for SSH on Linux.
  • PuTTY - Free telnet/SSH client. This is the most commonly used SSH client for Windows based systems.

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