All ports
Port4373/UDP
remctlPort
4373
Protocol
UDP
Category
Registered
Service
remctl
What is port 4373?
Port 4373/UDP is a Registered port, registered with IANA for specific applications. It is associated with the remctl service.
Remote Authenticated Command Service
Useful commands
nmapnmap -p 4373 -sV example.comnetcatnc -zv example.com 4373curlcurl -v http://example.com:4373/telnettelnet example.com 4373bash(echo > /dev/udp/example.com/4373) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 4373/udpDeny
sudo ufw deny 4373/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 4373 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 4373 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=4373/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 4373" dir=in action=allow protocol=UDP localport=4373Security 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- Outdated versions with vulnerabilities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 4373/UDP?
Port 4373/UDP is associated with the remctl service. Remote Authenticated Command Service
Is it safe to expose port 4373 to the Internet?
It depends on the service and configuration. Port 4373 (remctl) 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 4373 is open?
You can use nmap: `nmap -p 4373 -sV example.com`, netcat: `nc -zv example.com 4373`, or the bash command: `(echo > /dev/udp/example.com/4373) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 4373 on my firewall?
On Linux with UFW: `sudo ufw allow 4373/udp` (open) or `sudo ufw deny 4373/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 4373 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 4373" dir=in action=allow protocol=UDP localport=4373`.
What applications and services use port 4373?
Port 4373/UDP is used by the remctl service. Specific uses depend on the software and configuration. Check our related tools section for more information.