Windows 11 Open Ports !!top!! (Full)

Technical Paper: Network Port Management in Windows 11 Windows 11 manages network communications through logical "ports" that allow specific applications and services to send and receive data. Understanding which ports are open is critical for both system functionality (e.g., gaming, file sharing) and cybersecurity. 1. Common Open Ports in Windows 11

Method 2: Using the Command Prompt

1. Press the Windows key + R to open the Run dialog box.
2. Type cmd and press Enter to open the Command Prompt.
3. Type netsh advfirewall firewall delete rule name="Rule Name" and press Enter.

1. Press Win + R, type wf.msc, and press Enter.
2. Click Inbound Rules → New Rule.
3. Select Port → Next.
4. Choose TCP or UDP, then specify the port number (e.g., 445).
5. Select Block the connection.
6. Apply to all profiles (Domain, Private, Public).
7. Name the rule (e.g., “Block SMB port 445”) and finish.

But easier: use Get-NetTCPConnection – it’s built on the same API. windows 11 open ports

Port ranges: System ports range from 0 to 65535. Ports 0 through 1023 are "Well-Known Ports" reserved for core system privileges and protocols like HTTP (80), HTTPS (443), and SSH (22). 🔍 How to Check for Open Ports on Windows 11 Technical Paper: Network Port Management in Windows 11

• Use EDR/AV and logging to detect suspicious listener creation or network activity.

How to Close Open Ports in Windows 11

5. Closing Unnecessary Ports

A. Turn off services (most effective)

| Service | Ports | Command (Admin) | |---------|-------|----------------| | SMB 1.0/CIFS | 445 | Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol | | SMB 2.0/3.0 | 445 | Set-SmbServerConfiguration -EnableSMB2Protocol $false (careful) | | NetBIOS over TCP/IP | 137-139 | In network adapter → IPv4 → WINS → Disable NetBIOS | | LLMNR | 5355 | Group Policy → Computer Config → Admin Templates → Network → DNS Client → Turn off LLMNR | | mDNS | 5353 | Stop dnscache service or disable via registry | | Connected Devices | 5040 | Stop CDPSvc (may break dynamic lock, phone linking) | | Delivery Optimization | 7680 | Settings → Windows Update → Advanced → Delivery Optimization → Off | Press the Windows key + R to open the Run dialog box

5.3 Creating a Rule to Block a Specific Port

New-NetFirewallRule -DisplayName "Block port 445" `
    -Direction Inbound `
    -LocalPort 445 `
    -Protocol TCP `
    -Action Block