All ports
Port520/TCP
efsPort
520
Protocol
TCP
Category
Well-Known
Service
efs
What is port 520?
Port 520/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the efs service.
extended file name server
Useful commands
nmapnmap -p 520 -sV example.comnetcatnc -zv example.com 520curlcurl -v http://example.com:520/telnettelnet example.com 520bash(echo > /dev/tcp/example.com/520) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 520/tcpDeny
sudo ufw deny 520/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 520 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 520 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=520/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 520" dir=in action=allow protocol=TCP localport=520Security 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- Outdated versions with vulnerabilities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 520/TCP?
Port 520/TCP is associated with the efs service. extended file name server
Is it safe to expose port 520 to the Internet?
It depends on the service and configuration. Port 520 (efs) is a Well-Known 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 520 is open?
You can use nmap: `nmap -p 520 -sV example.com`, netcat: `nc -zv example.com 520`, or the bash command: `(echo > /dev/tcp/example.com/520) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 520 on my firewall?
On Linux with UFW: `sudo ufw allow 520/tcp` (open) or `sudo ufw deny 520/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 520 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 520" dir=in action=allow protocol=TCP localport=520`.
What applications and services use port 520?
Port 520/TCP is used by the efs service. Specific uses depend on the software and configuration. Check our related tools section for more information.