All ports
Port22/SCTP
sshPort
22
Protocol
SCTP
Category
Well-Known
Service
ssh
What is port 22?
Port 22/SCTP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the ssh service.
SSH
Useful commands
nmapnmap -p 22 -sV example.comnetcatnc -zv example.com 22curlcurl -v http://example.com:22/telnettelnet example.com 22bash(echo > /dev/sctp/example.com/22) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 22/sctpDeny
sudo ufw deny 22/sctpiptablesAllow
sudo iptables -A INPUT -p sctp --dport 22 -j ACCEPTDeny
sudo iptables -D INPUT -p sctp --dport 22 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=22/sctpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 22" dir=in action=allow protocol=SCTP localport=22Security Risks
- Unauthorized remote access to the server
- Brute force attacks against SSH credentials
- Exposure of private keys or misconfigurations
- Outdated versions with known vulnerabilities
Frequently Asked Questions
What service runs on port 22/SCTP?
Port 22/SCTP is associated with the ssh service. SSH
Is it safe to expose port 22 to the Internet?
It depends on the service and configuration. Port 22 (ssh) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 22 is open?
You can use nmap: `nmap -p 22 -sV example.com`, netcat: `nc -zv example.com 22`, or the bash command: `(echo > /dev/sctp/example.com/22) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 22 on my firewall?
On Linux with UFW: `sudo ufw allow 22/sctp` (open) or `sudo ufw deny 22/sctp` (close). With iptables: `sudo iptables -A INPUT -p sctp --dport 22 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 22" dir=in action=allow protocol=SCTP localport=22`.
What applications and services use port 22?
Port 22/SCTP is used by the ssh service. Specific uses depend on the software and configuration. Check our related tools section for more information.