Network Port: 22
Network Port Reference Guide
Registered Service Name
SSH / SFTP
Transport Protocol
TCP
Functional Overview
Port 22 is the industry standard for Secure Shell (SSH) remote terminal access and Secure File Transfer Protocol (SFTP) operations.
Security Risks & Vulnerabilities
Constant target for brute-force attacks and scanner probes. Implement public-key authentication, change the default port, or use fail2ban to harden.
How to audit network port status
1. Scan Open Ports: Use our Port Scanner utility to verify if this port is actively listening on your host.
2. Verify Encryption: Audit the service layer to confirm SSL/TLS is protecting transmission payload.
3. Hardening Rules: Apply the firewall instructions below to shut down unauthorized inbound ports.
UFW Firewall Rules
Allow Command
sudo ufw allow 22/tcp
Block Command
sudo ufw deny 22/tcp
iptables Firewall Rules
Allow Command
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
Block Command
sudo iptables -A INPUT -p tcp --dport 22 -j DROP