Open Ports | Windows 11

Windows built-in: Test-NetConnection for single port or PortQry (Microsoft tool) for scans.

Consider firewall and IDS: remote scans may be blocked or logged.

This prevents traffic but keeps the service running locally.

What "open ports" means

Common Windows 11 services and typical open ports (local defaults; may vary)

How to discover open ports on a Windows 11 machine windows 11 open ports

Firewall rules:

External scanning (to see what’s reachable from the network):

Assessing risk

How to reduce unnecessary open ports (actionable steps)

Identify services:

Stop/disable unused services:

Configure app settings:

Use Windows Defender Firewall:

Remove/disable legacy protocols:

Close ports on network devices:

Use VPNs and jump hosts:

Patch and harden:

Monitor:

Quick PowerShell commands cheat-sheet

Best practices summary (concise)

If you want, I can:

TCPView from Microsoft Sysinternals shows a live updating list of all endpoints, including remote addresses, state, and process. Far superior to netstat for dynamic analysis. Consider firewall and IDS: remote scans may be

For more detail, including the process ID (PID), use:

netstat -ano | findstr "LISTENING"

Then match the PID with Task Manager to identify the responsible application.

Allow RDP only from 192.168.1.0/24:

New-NetFirewallRule -DisplayName "RDP restricted" `
    -Direction Inbound `
    -LocalPort 3389 `
    -Protocol TCP `
    -RemoteAddress 192.168.1.0/24 `
    -Action Allow

Alerts:

Periodic scanning:

Threat intel:

Open Ports | Windows 11

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