Port 16789
cadsisvr · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | cadsisvr |
| Registered | 2015-06-02 |
| Modified | 2023-03-29 |
Frequently asked questions
What is port 16789 used for?
Port 16789 is registered with the IANA for cadsisvr (TCP/UDP). Description: This server provides callable services to mainframe External Security Managers from any TCP/IP platform; Reserved.
Is port 16789 a well-known port?
No. Port 16789 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 16789 is open?
Locally on Linux with ss -tulpn | grep ':16789\b', on Windows with netstat -ano | findstr :16789. To test a remote host use Test-NetConnection <host> -Port 16789 in PowerShell or nc -zv <host> 16789 on Linux/macOS.
How do I open port 16789 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 16789/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=16789/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 16789" -Direction Inbound -Protocol TCP -LocalPort 16789 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | cadsisvr | This server provides callable services to mainframe External Security Managers from any TCP/IP platform |
| UDP | – | Reserved |