All ports
Port20999/TCP
athand-mmpPort
20999
Protocol
TCP
Category
Registered
Service
athand-mmp
What is port 20999?
Port 20999/TCP is a Registered port, registered with IANA for specific applications. It is associated with the athand-mmp service.
At Hand MMP
Useful commands
nmapnmap -p 20999 -sV example.comnetcatnc -zv example.com 20999curlcurl -v http://example.com:20999/telnettelnet example.com 20999bash(echo > /dev/tcp/example.com/20999) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 20999/tcpDeny
sudo ufw deny 20999/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 20999 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 20999 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=20999/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 20999" dir=in action=allow protocol=TCP localport=20999Security 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- Outdated versions with vulnerabilities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 20999/TCP?
Port 20999/TCP is associated with the athand-mmp service. At Hand MMP
Is it safe to expose port 20999 to the Internet?
It depends on the service and configuration. Port 20999 (athand-mmp) 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 20999 is open?
You can use nmap: `nmap -p 20999 -sV example.com`, netcat: `nc -zv example.com 20999`, or the bash command: `(echo > /dev/tcp/example.com/20999) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 20999 on my firewall?
On Linux with UFW: `sudo ufw allow 20999/tcp` (open) or `sudo ufw deny 20999/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 20999 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 20999" dir=in action=allow protocol=TCP localport=20999`.
What applications and services use port 20999?
Port 20999/TCP is used by the athand-mmp service. Specific uses depend on the software and configuration. Check our related tools section for more information.