All ports
Port3521/TCP
mc3ssPort
3521
Protocol
TCP
Category
Registered
Service
mc3ss
What is port 3521?
Port 3521/TCP is a Registered port, registered with IANA for specific applications. It is associated with the mc3ss service.
Telequip Labs MC3SS
Useful commands
nmapnmap -p 3521 -sV example.comnetcatnc -zv example.com 3521curlcurl -v http://example.com:3521/telnettelnet example.com 3521bash(echo > /dev/tcp/example.com/3521) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3521/tcpDeny
sudo ufw deny 3521/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 3521 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 3521 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3521/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3521" dir=in action=allow protocol=TCP localport=3521Security 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- Outdated versions with vulnerabilities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 3521/TCP?
Port 3521/TCP is associated with the mc3ss service. Telequip Labs MC3SS
Is it safe to expose port 3521 to the Internet?
It depends on the service and configuration. Port 3521 (mc3ss) 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 3521 is open?
You can use nmap: `nmap -p 3521 -sV example.com`, netcat: `nc -zv example.com 3521`, or the bash command: `(echo > /dev/tcp/example.com/3521) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3521 on my firewall?
On Linux with UFW: `sudo ufw allow 3521/tcp` (open) or `sudo ufw deny 3521/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 3521 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3521" dir=in action=allow protocol=TCP localport=3521`.
What applications and services use port 3521?
Port 3521/TCP is used by the mc3ss service. Specific uses depend on the software and configuration. Check our related tools section for more information.