All ports
Port49/UDP
tacacsPort
49
Protocol
UDP
Category
Well-Known
Service
tacacs
What is port 49?
Port 49/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the tacacs service.
Login Host Protocol (TACACS)
Useful commands
nmapnmap -p 49 -sV example.comnetcatnc -zv example.com 49curlcurl -v http://example.com:49/telnettelnet example.com 49bash(echo > /dev/udp/example.com/49) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 49/udpDeny
sudo ufw deny 49/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 49 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 49 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=49/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 49" dir=in action=allow protocol=UDP localport=49Security 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- Outdated versions with vulnerabilities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 49/UDP?
Port 49/UDP is associated with the tacacs service. Login Host Protocol (TACACS)
Is it safe to expose port 49 to the Internet?
It depends on the service and configuration. Port 49 (tacacs) 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 49 is open?
You can use nmap: `nmap -p 49 -sV example.com`, netcat: `nc -zv example.com 49`, or the bash command: `(echo > /dev/udp/example.com/49) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 49 on my firewall?
On Linux with UFW: `sudo ufw allow 49/udp` (open) or `sudo ufw deny 49/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 49 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 49" dir=in action=allow protocol=UDP localport=49`.
What applications and services use port 49?
Port 49/UDP is used by the tacacs service. Specific uses depend on the software and configuration. Check our related tools section for more information.