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TCP
Safe
22 SSH / SFTP
SSH secures interactive shell access, tunneling, and SFTP transfers for servers and infrastructure tooling.
Security Context
Port 22 is commonly expected on managed infrastructure, but it still needs scoped exposure, TLS where applicable, and service-specific hardening.
Nmap Check
Use a version probe first so you confirm whether the expected service is really what is listening on this port.
nmap -sV -p 22 <host>Firewall Commands
UFW
sudo ufw allow 22/tcpiptables
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT