All ports
Port3780/TCP
nnpPort
3780
Protocol
TCP
Category
Registered
Service
nnp
What is port 3780?
Port 3780/TCP is a Registered port, registered with IANA for specific applications. It is associated with the nnp service.
Nuzzler Network Protocol
Useful commands
nmapnmap -p 3780 -sV example.comnetcatnc -zv example.com 3780curlcurl -v http://example.com:3780/telnettelnet example.com 3780bash(echo > /dev/tcp/example.com/3780) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3780/tcpDeny
sudo ufw deny 3780/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 3780 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 3780 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3780/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3780" dir=in action=allow protocol=TCP localport=3780Security 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- Outdated versions with vulnerabilities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 3780/TCP?
Port 3780/TCP is associated with the nnp service. Nuzzler Network Protocol
Is it safe to expose port 3780 to the Internet?
It depends on the service and configuration. Port 3780 (nnp) 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 3780 is open?
You can use nmap: `nmap -p 3780 -sV example.com`, netcat: `nc -zv example.com 3780`, or the bash command: `(echo > /dev/tcp/example.com/3780) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3780 on my firewall?
On Linux with UFW: `sudo ufw allow 3780/tcp` (open) or `sudo ufw deny 3780/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 3780 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3780" dir=in action=allow protocol=TCP localport=3780`.
What applications and services use port 3780?
Port 3780/TCP is used by the nnp service. Specific uses depend on the software and configuration. Check our related tools section for more information.