Port 446
ddm-rdb · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | ddm-rdb |
Frequently asked questions
What is port 446 used for?
Port 446 is registered with the IANA for ddm-rdb (TCP/UDP). Description: DDM-Remote Relational Database Access.
Is port 446 a well-known port?
Yes. Port 446 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 446 is open?
Locally on Linux with ss -tulpn | grep ':446\b', on Windows with netstat -ano | findstr :446. To test a remote host use Test-NetConnection <host> -Port 446 in PowerShell or nc -zv <host> 446 on Linux/macOS.
How do I open port 446 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 446/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=446/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 446" -Direction Inbound -Protocol TCP -LocalPort 446 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ddm-rdb | DDM-Remote Relational Database Access |
| UDP | ddm-rdb | DDM-Remote Relational Database Access |