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For outbound restrictions, repeat the process for .
If ShieldsUP! says your ports are "Stealth," it means Windows 11 is dropping packets (not even responding with "Closed"). This is the ideal secure state.
If your network audit reveals an open port that you do not require, you should close it immediately to minimize your attack surface. Step 1: Disabling the Underlying Service
Microsoft security experts strongly advise: . Always prefer allowing applications through the firewall rather than manually opening ports. windows 11 open ports
Then match the PID with Task Manager to identify the responsible application.
This provides a clean, readable table of local ports, remote addresses, and owning processes.
Every network-connected device uses ports to direct traffic to the correct application. Ports are numbered from 0 to 65535 and are split into two primary protocols: For outbound restrictions, repeat the process for
-o displays the Process Identifier (PID) associated with each connection.
If you used the netstat -ano command, note the of the suspicious open port. You can instantly identify the parent application using the Windows Task Manager: Press Ctrl + Shift + Esc to launch Task Manager . Click on the Details tab on the left sidebar.
: Search for "Windows Defender Firewall with Advanced Security" in the Start menu or find it under Settings > Privacy & security > Windows Security > Firewall & network protection > Advanced settings . This is the ideal secure state
Open the , type Windows Defender Firewall with Advanced Security , and press Enter . Click Inbound Rules in the left pane. Click New Rule... in the right-hand Actions pane. Select Port and click Next .
Windows 11 is chatty by default. Here are a few ports that often open by default and why you might consider closing them if you aren't using them:
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING 1234 TCP [::]:445 [::]:0 LISTENING 4
For outbound restrictions, repeat the process for .
If ShieldsUP! says your ports are "Stealth," it means Windows 11 is dropping packets (not even responding with "Closed"). This is the ideal secure state.
If your network audit reveals an open port that you do not require, you should close it immediately to minimize your attack surface. Step 1: Disabling the Underlying Service
Microsoft security experts strongly advise: . Always prefer allowing applications through the firewall rather than manually opening ports.
Then match the PID with Task Manager to identify the responsible application.
This provides a clean, readable table of local ports, remote addresses, and owning processes.
Every network-connected device uses ports to direct traffic to the correct application. Ports are numbered from 0 to 65535 and are split into two primary protocols:
-o displays the Process Identifier (PID) associated with each connection.
If you used the netstat -ano command, note the of the suspicious open port. You can instantly identify the parent application using the Windows Task Manager: Press Ctrl + Shift + Esc to launch Task Manager . Click on the Details tab on the left sidebar.
: Search for "Windows Defender Firewall with Advanced Security" in the Start menu or find it under Settings > Privacy & security > Windows Security > Firewall & network protection > Advanced settings .
Open the , type Windows Defender Firewall with Advanced Security , and press Enter . Click Inbound Rules in the left pane. Click New Rule... in the right-hand Actions pane. Select Port and click Next .
Windows 11 is chatty by default. Here are a few ports that often open by default and why you might consider closing them if you aren't using them:
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING 1234 TCP [::]:445 [::]:0 LISTENING 4
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