All ports
Port3121/TCP
pcmk-remotePort
3121
Protocol
TCP
Category
Registered
Service
pcmk-remote
What is port 3121?
Port 3121/TCP is a Registered port, registered with IANA for specific applications. It is associated with the pcmk-remote service.
The pacemaker remote (pcmk-remote) service extends high availability functionality outside of the Linux cluster into remote nodes.
Useful commands
nmapnmap -p 3121 -sV example.comnetcatnc -zv example.com 3121curlcurl -v http://example.com:3121/telnettelnet example.com 3121bash(echo > /dev/tcp/example.com/3121) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3121/tcpDeny
sudo ufw deny 3121/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 3121 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 3121 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3121/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3121" dir=in action=allow protocol=TCP localport=3121Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 3121/TCP?
Port 3121/TCP is associated with the pcmk-remote service. The pacemaker remote (pcmk-remote) service extends high availability functionality outside of the Linux cluster into remote nodes.
Is it safe to expose port 3121 to the Internet?
It depends on the service and configuration. Port 3121 (pcmk-remote) is a Registered 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 3121 is open?
You can use nmap: `nmap -p 3121 -sV example.com`, netcat: `nc -zv example.com 3121`, or the bash command: `(echo > /dev/tcp/example.com/3121) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3121 on my firewall?
On Linux with UFW: `sudo ufw allow 3121/tcp` (open) or `sudo ufw deny 3121/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 3121 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3121" dir=in action=allow protocol=TCP localport=3121`.
What applications and services use port 3121?
Port 3121/TCP is used by the pcmk-remote service. Specific uses depend on the software and configuration. Check our related tools section for more information.