All ports
Port1757/TCP
cnhrpPort
1757
Protocol
TCP
Category
Registered
Service
cnhrp
What is port 1757?
Port 1757/TCP is a Registered port, registered with IANA for specific applications. It is associated with the cnhrp service.
cnhrp
Useful commands
nmapnmap -p 1757 -sV example.comnetcatnc -zv example.com 1757curlcurl -v http://example.com:1757/telnettelnet example.com 1757bash(echo > /dev/tcp/example.com/1757) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1757/tcpDeny
sudo ufw deny 1757/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 1757 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 1757 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1757/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1757" dir=in action=allow protocol=TCP localport=1757Security 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- Outdated versions with vulnerabilities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 1757/TCP?
Port 1757/TCP is associated with the cnhrp service. cnhrp
Is it safe to expose port 1757 to the Internet?
It depends on the service and configuration. Port 1757 (cnhrp) 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 1757 is open?
You can use nmap: `nmap -p 1757 -sV example.com`, netcat: `nc -zv example.com 1757`, or the bash command: `(echo > /dev/tcp/example.com/1757) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1757 on my firewall?
On Linux with UFW: `sudo ufw allow 1757/tcp` (open) or `sudo ufw deny 1757/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 1757 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1757" dir=in action=allow protocol=TCP localport=1757`.
What applications and services use port 1757?
Port 1757/TCP is used by the cnhrp service. Specific uses depend on the software and configuration. Check our related tools section for more information.