All ports
Port12109/UDP
rets-sslPort
12109
Protocol
UDP
Category
Registered
Service
rets-ssl
What is port 12109?
Port 12109/UDP is a Registered port, registered with IANA for specific applications. It is associated with the rets-ssl service.
RETS over SSL
Useful commands
nmapnmap -p 12109 -sV example.comnetcatnc -zv example.com 12109curlcurl -v http://example.com:12109/telnettelnet example.com 12109bash(echo > /dev/udp/example.com/12109) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 12109/udpDeny
sudo ufw deny 12109/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 12109 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 12109 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=12109/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 12109" dir=in action=allow protocol=UDP localport=12109Security 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- Outdated versions with vulnerabilities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 12109/UDP?
Port 12109/UDP is associated with the rets-ssl service. RETS over SSL
Is it safe to expose port 12109 to the Internet?
It depends on the service and configuration. Port 12109 (rets-ssl) 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 12109 is open?
You can use nmap: `nmap -p 12109 -sV example.com`, netcat: `nc -zv example.com 12109`, or the bash command: `(echo > /dev/udp/example.com/12109) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 12109 on my firewall?
On Linux with UFW: `sudo ufw allow 12109/udp` (open) or `sudo ufw deny 12109/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 12109 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 12109" dir=in action=allow protocol=UDP localport=12109`.
What applications and services use port 12109?
Port 12109/UDP is used by the rets-ssl service. Specific uses depend on the software and configuration. Check our related tools section for more information.