All ports
Port2021/TCP
servexecPort
2021
Protocol
TCP
Category
Registered
Service
servexec
What is port 2021?
Port 2021/TCP is a Registered port, registered with IANA for specific applications. It is associated with the servexec service.
Useful commands
nmapnmap -p 2021 -sV example.comnetcatnc -zv example.com 2021curlcurl -v http://example.com:2021/telnettelnet example.com 2021bash(echo > /dev/tcp/example.com/2021) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 2021/tcpDeny
sudo ufw deny 2021/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 2021 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 2021 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=2021/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 2021" dir=in action=allow protocol=TCP localport=2021Security 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- Outdated versions with vulnerabilities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 2021/TCP?
Port 2021/TCP is associated with the servexec service. No detailed description is available in the IANA registry.
Is it safe to expose port 2021 to the Internet?
It depends on the service and configuration. Port 2021 (servexec) 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 2021 is open?
You can use nmap: `nmap -p 2021 -sV example.com`, netcat: `nc -zv example.com 2021`, or the bash command: `(echo > /dev/tcp/example.com/2021) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 2021 on my firewall?
On Linux with UFW: `sudo ufw allow 2021/tcp` (open) or `sudo ufw deny 2021/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 2021 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 2021" dir=in action=allow protocol=TCP localport=2021`.
What applications and services use port 2021?
Port 2021/TCP is used by the servexec service. Specific uses depend on the software and configuration. Check our related tools section for more information.