All ports
Port1687/UDP
nsjtp-ctrlPort
1687
Protocol
UDP
Category
Registered
Service
nsjtp-ctrl
What is port 1687?
Port 1687/UDP is a Registered port, registered with IANA for specific applications. It is associated with the nsjtp-ctrl service.
nsjtp-ctrl
Useful commands
nmapnmap -p 1687 -sV example.comnetcatnc -zv example.com 1687curlcurl -v http://example.com:1687/telnettelnet example.com 1687bash(echo > /dev/udp/example.com/1687) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1687/udpDeny
sudo ufw deny 1687/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 1687 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 1687 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1687/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1687" dir=in action=allow protocol=UDP localport=1687Security 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- Outdated versions with vulnerabilities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 1687/UDP?
Port 1687/UDP is associated with the nsjtp-ctrl service. nsjtp-ctrl
Is it safe to expose port 1687 to the Internet?
It depends on the service and configuration. Port 1687 (nsjtp-ctrl) 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 1687 is open?
You can use nmap: `nmap -p 1687 -sV example.com`, netcat: `nc -zv example.com 1687`, or the bash command: `(echo > /dev/udp/example.com/1687) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1687 on my firewall?
On Linux with UFW: `sudo ufw allow 1687/udp` (open) or `sudo ufw deny 1687/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 1687 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1687" dir=in action=allow protocol=UDP localport=1687`.
What applications and services use port 1687?
Port 1687/UDP is used by the nsjtp-ctrl service. Specific uses depend on the software and configuration. Check our related tools section for more information.