: Windows allows different firewall rules for Domain, Private, and Public networks. Configure stricter rules for Public networks (coffee shops, airports) and more permissive ones for your Private home network.
The port being open doesn't guarantee the application is functioning correctly. Check the application's logs, verify your firewall isn't blocking the traffic at the application level, and test connectivity from another device on your network.
To accomplish the same with PowerShell:
Look at the line. If it says True , the port is open and responding. Step 2: How to Open Ports in Windows 11 Firewall windows 11 open ports
The netstat (network statistics) command has been the go-to tool for decades. Open (right-click Start → Terminal (Admin) or Command Prompt (Admin)).
How to discover open ports on a Windows 11 machine
There's a frequent misunderstanding that Windows can remotely manipulate your router to open ports. In reality, —it can only use ports if the router is already misconfigured. : Windows allows different firewall rules for Domain,
| Port | Protocol | Service | Purpose | |------|----------|---------|---------| | 135 | TCP | RPC Endpoint Mapper | Used by DCOM and remote admin tools | | 139 | TCP | NetBIOS Session Service | Legacy file sharing (often disabled) | | 445 | TCP | SMB | Modern file and printer sharing | | 5040 | TCP | Windows CDP Service | Connected Devices Platform | | 7680 | TCP | Windows Update Delivery Optimization | P2P update sharing (can be disabled) | | 49664–65535 | TCP | Dynamic RPC ports | Various system services |
⚠️ If your NetBIOS or SMB ports (137-139, 445) are exposed to the internet, you face significant risk of automated attacks and ransomware. Secure these ports with tight firewall rules and strong authentication.
Only when an application isn't listed should you manually open a port: Check the application's logs, verify your firewall isn't
The netstat (Network Statistics) command has been part of Windows for decades and remains the most direct way to examine connections and discover open network ports. Here's how to use it:
Open Command Prompt as an administrator. Click the Search button on your taskbar, type cmd , right-click Command Prompt, and select Run as administrator .
The numerical ID of the software running that specific port. Method B: Using PowerShell (Get-NetTCPConnection) For a cleaner, filterable overview, use PowerShell: Right-click the Start Menu and choose Terminal (Admin) .