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.
More info