Port 445
microsoft-ds · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | microsoft-ds |
Frequently asked questions
What is port 445 used for?
Port 445 is registered with the IANA for microsoft-ds (TCP/UDP). Description: Microsoft-DS.
Is port 445 a well-known port?
Yes. Port 445 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 445 is open?
Locally on Linux with ss -tulpn | grep ':445\b', on Windows with netstat -ano | findstr :445. To test a remote host use Test-NetConnection <host> -Port 445 in PowerShell or nc -zv <host> 445 on Linux/macOS.
How do I open port 445 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 445/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=445/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 445" -Direction Inbound -Protocol TCP -LocalPort 445 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | microsoft-ds | Microsoft-DS |
| UDP | microsoft-ds | Microsoft-DS |