Windows 11 Open Ports Instant

Example: To close port 445 (SMB), stop the “Server” service. However, this will disable file sharing.

Test-NetConnection -ComputerName localhost -Port 9000

: Some community reviews on Reddit express concern that open ports can be used for telemetry or background tracking, though these are typically not "listening" ports for external attacks. How to Review and Check Open Ports

Windows 11 manages open ports primarily through the Windows Defender Firewall with Advanced Security windows 11 open ports

| Port | Protocol | Service | Risk | |------|----------|---------|------| | 135 | TCP | RPC Endpoint Mapper | High (EternalBlue-like exploits historically) | | 139, 445 | TCP | NetBIOS/SMB | High – file sharing, remote admin | | 3389 | TCP | RDP | High if exposed to internet | | 5985, 5986 | TCP | WinRM (HTTP/HTTPS) | Medium – PowerShell remoting | | 5040 | TCP | Windows Remote Management service | Medium | | 7680 | TCP | Windows Update Delivery Optimization (P2P) | Low – but can leak internal IPs | | 49664–65535 | TCP | RPC dynamic ports (for MMC, AD tools) | Medium – hard to firewall |

The Ultimate Guide to Checking and Opening Ports in Windows 11

Go to the tab and click Open Resource Monitor at the bottom. Navigate to the Network tab. Expand the Listening Ports section. Example: To close port 445 (SMB), stop the

Tools like (Microsoft Sysinternals) or CurrPorts offer a graphical interface to see open ports, close connections, and kill processes instantly.

Press the , type cmd , and select Run as administrator . Type the following command and press Enter : netstat -ano Use code with caution.

Many common applications have specific port requirements. Knowing what to open is part of the job. How to Review and Check Open Ports Windows

Windows 11 (and Windows Server 2019+) uses a default ephemeral port range of . You can check this with:

In this guide, we’ll walk you through how to check for open ports in Windows 11, identify which apps are using them, and how to close them to harden your security.