Port 22

Q: What is port 22?

Encrypted remote shell and file transfer (SSH) SSH (Secure Shell) on port 22 is the de facto standard for secure remote administration of Linux/Unix servers. It provides an encrypted terminal session, file transfer (SCP, SFTP), and port forwarding. It replaced the insecure Telnet (port 23) and rlogin protocols. Because of its ubiquity, port 22 is a constant target for brute-force attacks. Best practices include using SSH key pairs instead of passwords, disabling root login, deploying fail2ban, and optionally moving SSH to a non-standard port.

SSH

Encrypted remote shell and file transfer (SSH)

Port

Protocol

TCP

Service

SSH

Security

Restricted

Full name: Secure Shell

What is port 22?

SSH (Secure Shell) on port 22 is the de facto standard for secure remote administration of Linux/Unix servers. It provides an encrypted terminal session, file transfer (SCP, SFTP), and port forwarding. It replaced the insecure Telnet (port 23) and rlogin protocols. Because of its ubiquity, port 22 is a constant target for brute-force attacks. Best practices include using SSH key pairs instead of passwords, disabling root login, deploying fail2ban, and optionally moving SSH to a non-standard port.

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