Dictionary · Protocols and Ports
SSH
SSH — Secure Shell
Remote access · Beginner
A protocol for encrypted remote login, command execution, and tunneled file transfer. It replaced cleartext terminal sessions for administration.
Administrators use it to open a protected terminal on a server they are allowed to manage. Keys are safer than reused passwords, and the session is encrypted.
Example: An administrator connects to a Linux server, authenticates with a key, and edits a configuration file in a remote shell.
Ports
- TCP 22 — Remote shell and file transfer
Common misconception
- It is not the older cleartext terminal protocol, and file transfer over it is not the same as classic file transfer on port 21.