All ports
Port3936/TCP
mailproxPort
3936
Protocol
TCP
Category
Registered
Service
mailprox
What is port 3936?
Port 3936/TCP is a Registered port, registered with IANA for specific applications. It is associated with the mailprox service.
Mailprox
Useful commands
nmapnmap -p 3936 -sV example.comnetcatnc -zv example.com 3936curlcurl -v http://example.com:3936/telnettelnet example.com 3936bash(echo > /dev/tcp/example.com/3936) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3936/tcpDeny
sudo ufw deny 3936/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 3936 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 3936 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3936/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3936" dir=in action=allow protocol=TCP localport=3936Security Risks
- Open relay used for spam
- Email spoofing
- Brute force attacks against email accounts
- Information disclosure in email headers
Frequently Asked Questions
What service runs on port 3936/TCP?
Port 3936/TCP is associated with the mailprox service. Mailprox
Is it safe to expose port 3936 to the Internet?
It depends on the service and configuration. Port 3936 (mailprox) 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 3936 is open?
You can use nmap: `nmap -p 3936 -sV example.com`, netcat: `nc -zv example.com 3936`, or the bash command: `(echo > /dev/tcp/example.com/3936) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3936 on my firewall?
On Linux with UFW: `sudo ufw allow 3936/tcp` (open) or `sudo ufw deny 3936/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 3936 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3936" dir=in action=allow protocol=TCP localport=3936`.
What applications and services use port 3936?
Port 3936/TCP is used by the mailprox service. Specific uses depend on the software and configuration. Check our related tools section for more information.