All ports
Port3723/TCP
sychrondPort
3723
Protocol
TCP
Category
Registered
Service
sychrond
What is port 3723?
Port 3723/TCP is a Registered port, registered with IANA for specific applications. It is associated with the sychrond service.
Sychron Service Daemon
Useful commands
nmapnmap -p 3723 -sV example.comnetcatnc -zv example.com 3723curlcurl -v http://example.com:3723/telnettelnet example.com 3723bash(echo > /dev/tcp/example.com/3723) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3723/tcpDeny
sudo ufw deny 3723/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 3723 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 3723 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3723/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3723" dir=in action=allow protocol=TCP localport=3723Security 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- Outdated versions with vulnerabilities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 3723/TCP?
Port 3723/TCP is associated with the sychrond service. Sychron Service Daemon
Is it safe to expose port 3723 to the Internet?
It depends on the service and configuration. Port 3723 (sychrond) 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 3723 is open?
You can use nmap: `nmap -p 3723 -sV example.com`, netcat: `nc -zv example.com 3723`, or the bash command: `(echo > /dev/tcp/example.com/3723) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3723 on my firewall?
On Linux with UFW: `sudo ufw allow 3723/tcp` (open) or `sudo ufw deny 3723/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 3723 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3723" dir=in action=allow protocol=TCP localport=3723`.
What applications and services use port 3723?
Port 3723/TCP is used by the sychrond service. Specific uses depend on the software and configuration. Check our related tools section for more information.