All ports
Port16789/TCP
cadsisvrPort
16789
Protocol
TCP
Category
Registered
Service
cadsisvr
What is port 16789?
Port 16789/TCP is a Registered port, registered with IANA for specific applications. It is associated with the cadsisvr service.
This server provides callable services to mainframe External Security Managers from any TCP/IP platform
Useful commands
nmapnmap -p 16789 -sV example.comnetcatnc -zv example.com 16789curlcurl -v http://example.com:16789/telnettelnet example.com 16789bash(echo > /dev/tcp/example.com/16789) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 16789/tcpDeny
sudo ufw deny 16789/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 16789 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 16789 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=16789/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 16789" dir=in action=allow protocol=TCP localport=16789Security 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- Outdated versions with vulnerabilities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 16789/TCP?
Port 16789/TCP is associated with the cadsisvr service. This server provides callable services to mainframe External Security Managers from any TCP/IP platform
Is it safe to expose port 16789 to the Internet?
It depends on the service and configuration. Port 16789 (cadsisvr) 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 16789 is open?
You can use nmap: `nmap -p 16789 -sV example.com`, netcat: `nc -zv example.com 16789`, or the bash command: `(echo > /dev/tcp/example.com/16789) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 16789 on my firewall?
On Linux with UFW: `sudo ufw allow 16789/tcp` (open) or `sudo ufw deny 16789/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 16789 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 16789" dir=in action=allow protocol=TCP localport=16789`.
What applications and services use port 16789?
Port 16789/TCP is used by the cadsisvr service. Specific uses depend on the software and configuration. Check our related tools section for more information.