11 Open Ports - Windows

netsh interface portproxy show all

Press Win + S and type "Windows Defender Firewall with Advanced Security" and click the top result.

Windows 11 includes a powerful portproxy feature accessible via the netsh command:

Ensure your network is set to "Private" when at home and "Public" in cafes, as this dictates how the firewall behaves. windows 11 open ports

: This is the most user-friendly method. It lists the Image (program name), the Port , and the Firewall Status all in one view. Security Recommendation

You can also use third-party tools like:

netstat -ano | findstr LISTENING

By mastering netstat , PowerShell, and the Windows Firewall, you ensure that your system serves your needs—without serving intruders. Stay vigilant, keep your firewall on, and remember: On the internet, every open port is an invitation.

If you must expose a port for legitimate reasons (e.g., RDP):

Limit open ports to private networks rather than public Wi-Fi. Summary Checklist Description Open Firewall Search "Advanced Security" in Windows. Select Inbound Rules -> New Rule -> Port. Select TCP/UDP and specific port number. Select "Allow the connection". Use netstat to confirm it is listening. netsh interface portproxy show all Press Win +

Port 135 is the RPC Endpoint Mapper. It acts as a directory service for DCOM (Distributed Component Object Model) applications. When a client wants to communicate with a remote Windows service (like the Registry or Service Control Manager), they first query port 135 to find the dynamic port assigned to that service.

Alternatively, you can find the application directly inside the command prompt by typing: tasklist /fi "pid eq [INSERT_PID_NUMBER]" Use code with caution. How to Close Unwanted Open Ports

One of the most common Windows 11 networking errors is: "Only one usage of each socket address is normally permitted." It lists the Image (program name), the Port

Focuses on connection reliability. It verifies that all data packets arrive intact and in order (used for web browsing, SSH, and file transfers).