SSH (Secure SHell) is used to establish terminal connections to other computers. SSH enables you to log on to another computer. SSH sends all traffic, including passwords, encrypted. SSH usually uses a high port on the client, port 22 on the server and the TCP protocol.

This corresponds to the following service definition:
| Services | ||||
|---|---|---|---|---|
| Name | Protocol | Firewall type | Client ports | Server ports |
| ssh | TCP | Dynamic session management | 1024-65535 | 22 |
See the SMTP or HTTP section for information on how to create firewall rules and relays.