All ports
Port2391/UDP
3com-net-mgmtPort
2391
Protocol
UDP
Category
Registered
Service
3com-net-mgmt
What is port 2391?
Port 2391/UDP is a Registered port, registered with IANA for specific applications. It is associated with the 3com-net-mgmt service.
3COM Net Management
Useful commands
nmapnmap -p 2391 -sV example.comnetcatnc -zv example.com 2391curlcurl -v http://example.com:2391/telnettelnet example.com 2391bash(echo > /dev/udp/example.com/2391) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 2391/udpDeny
sudo ufw deny 2391/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 2391 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 2391 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=2391/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 2391" dir=in action=allow protocol=UDP localport=2391Security 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- Outdated versions with vulnerabilities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 2391/UDP?
Port 2391/UDP is associated with the 3com-net-mgmt service. 3COM Net Management
Is it safe to expose port 2391 to the Internet?
It depends on the service and configuration. Port 2391 (3com-net-mgmt) 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 2391 is open?
You can use nmap: `nmap -p 2391 -sV example.com`, netcat: `nc -zv example.com 2391`, or the bash command: `(echo > /dev/udp/example.com/2391) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 2391 on my firewall?
On Linux with UFW: `sudo ufw allow 2391/udp` (open) or `sudo ufw deny 2391/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 2391 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 2391" dir=in action=allow protocol=UDP localport=2391`.
What applications and services use port 2391?
Port 2391/UDP is used by the 3com-net-mgmt service. Specific uses depend on the software and configuration. Check our related tools section for more information.