Port 22 — SSH

TCP · Port 22/TCP is used for Secure Shell (SSH) connections, a cryptographic protocol for secure remote access to network devices and servers. SSH provides confidentiality, integrity, and authentication of data transmitted over the network, making it an essential service for securing remote access.

Port Number: 22
Service Name: SSH
Protocol: TCP
Common Software: OpenSSH, Dropbear

Security Notes

Restrict SSH access to specific IPs. Disable password auth - use key-based authentication. Change default port.

FAQ

What is port 22 used for?

Port 22 is used for SSH. Port 22/TCP is used for Secure Shell (SSH) connections, a cryptographic protocol for secure remote access to network devices and servers. SSH provides confidentiality, integrity, and authentication of data transmitted over the network, making it an essential service for securing remote access. Common software: OpenSSH, Dropbear.

Is port 22 dangerous to leave open?

Restrict SSH access to specific IPs. Disable password auth - use key-based authentication. Change default port.

How do I check if port 22 is open?

Use nmap: nmap -p 22 <target> or check locally: ss -tlnp | rg 22