All ports
Port3390/UDP
dscPort
3390
Protocol
UDP
Category
Registered
Service
dsc
What is port 3390?
Port 3390/UDP is a Registered port, registered with IANA for specific applications. It is associated with the dsc service.
Distributed Service Coordinator
Useful commands
nmapnmap -p 3390 -sV example.comnetcatnc -zv example.com 3390curlcurl -v http://example.com:3390/telnettelnet example.com 3390bash(echo > /dev/udp/example.com/3390) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3390/udpDeny
sudo ufw deny 3390/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 3390 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 3390 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3390/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3390" dir=in action=allow protocol=UDP localport=3390Security 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- Outdated versions with vulnerabilities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 3390/UDP?
Port 3390/UDP is associated with the dsc service. Distributed Service Coordinator
Is it safe to expose port 3390 to the Internet?
It depends on the service and configuration. Port 3390 (dsc) 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 3390 is open?
You can use nmap: `nmap -p 3390 -sV example.com`, netcat: `nc -zv example.com 3390`, or the bash command: `(echo > /dev/udp/example.com/3390) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3390 on my firewall?
On Linux with UFW: `sudo ufw allow 3390/udp` (open) or `sudo ufw deny 3390/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 3390 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3390" dir=in action=allow protocol=UDP localport=3390`.
What applications and services use port 3390?
Port 3390/UDP is used by the dsc service. Specific uses depend on the software and configuration. Check our related tools section for more information.