Port 22: SSH

Secure Shell: remote logins, SFTP and SCP file transfer, and tunnels. Every public SSH port sees thousands of password guesses a day. Use keys, disable password logins, and restrict by source address where you can.

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Examples:

Ports

1 of 41

Port Lookup

Port 22 at a glance

Port22
ProtocolTCP
ServiceSSH
Open to the Internet?Only to addresses that need it
See What Is Listeningss -lntup | grep ':22 '
Test From Outsidenc -zv your-server 22
Block with UFWufw deny 22/tcp
Block with nftablesnft add rule inet filter input tcp dport 22 drop

SSH uses TCP port 22. Secure Shell: remote logins, SFTP and SCP file transfer, and tunnels.

Every public SSH port sees thousands of password guesses a day. Use keys, disable password logins, and restrict by source address where you can.

Allow port 22 only from the addresses that need it: your office, a VPN or a bastion host. The firewall rule generator builds those rules for nftables, iptables and UFW.

Other Ports

20 FTP Data21 FTP22 SSH23 Telnet25 SMTP53 DNS67 DHCP Server80 HTTP110 POP3123 NTP143 IMAP161 SNMP389 LDAP443 HTTPS445 SMB465 SMTPS514 Syslog587 Mail Submission853 DNS over TLS993 IMAPS995 POP3S1194 OpenVPN1433 Microsoft SQL Server1900 SSDP / UPnP2049 NFS2083 cPanel (SSL)2087 WHM (SSL)3306 MySQL / MariaDB3389 RDP3478 STUN / TURN5060 SIP5432 PostgreSQL5900 VNC6379 Redis8006 Proxmox VE8080 HTTP Alternate8443 HTTPS Alternate11211 Memcached25565 Minecraft27017 MongoDB51820 WireGuard

Questions

What is port 22 used for?
SSH. Secure Shell: remote logins, SFTP and SCP file transfer, and tunnels.
Is it safe to open port 22?
Only to addresses that need it. Every public SSH port sees thousands of password guesses a day. Use keys, disable password logins, and restrict by source address where you can.
How do I check if port 22 is open?
On the server, ss -lntup | grep ':22 ' shows what is listening. From another machine, nc -zv your-server 22 shows whether the firewall lets it through.
How do I block port 22?
With UFW: ufw deny 22/tcp. With nftables, add a drop rule for dport 22 in your input chain.

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