All ports
Port3917/UDP
aftmuxPort
3917
Protocol
UDP
Category
Registered
Service
aftmux
What is port 3917?
Port 3917/UDP is a Registered port, registered with IANA for specific applications. It is associated with the aftmux service.
AFT multiplex port
Useful commands
nmapnmap -p 3917 -sV example.comnetcatnc -zv example.com 3917curlcurl -v http://example.com:3917/telnettelnet example.com 3917bash(echo > /dev/udp/example.com/3917) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3917/udpDeny
sudo ufw deny 3917/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 3917 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 3917 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3917/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3917" dir=in action=allow protocol=UDP localport=3917Security 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- Outdated versions with vulnerabilities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 3917/UDP?
Port 3917/UDP is associated with the aftmux service. AFT multiplex port
Is it safe to expose port 3917 to the Internet?
It depends on the service and configuration. Port 3917 (aftmux) 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 3917 is open?
You can use nmap: `nmap -p 3917 -sV example.com`, netcat: `nc -zv example.com 3917`, or the bash command: `(echo > /dev/udp/example.com/3917) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3917 on my firewall?
On Linux with UFW: `sudo ufw allow 3917/udp` (open) or `sudo ufw deny 3917/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 3917 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3917" dir=in action=allow protocol=UDP localport=3917`.
What applications and services use port 3917?
Port 3917/UDP is used by the aftmux service. Specific uses depend on the software and configuration. Check our related tools section for more information.