Windows Firewall rules (what's allowed)
Quick PowerShell commands cheat-sheet
Shows your computer's IP followed by the port number (e.g., 127.0.0.1:443 ). windows 11 open ports
Type: Get-NetTCPConnection -State Listen | Select-Object LocalAddress, LocalPort, State
When a port is "open," it means your computer is listening for traffic on that specific door. If a malicious actor knows a port is open and finds a vulnerability in the software listening to it, they can slip inside your system. If you need help troubleshooting a specific network
If you need help troubleshooting a specific network issue, let me know: What are you trying to host? Are you getting an error message when trying to connect? What brand/model of router are you using?
Never disable the entire firewall to get an application to work. Instead, create a precise, custom rule. Never disable the entire firewall to get an
Press the , type cmd , and select Run as Administrator . Type the following command and press Enter: netstat -ab
Open ports are necessary for various reasons:
You will see a list of connections. The number after the colon ( : ) in the local address column is the open port number. The final number on the right is the PID (Process Identifier) using that port. Method 2: Using PowerShell
This command shows active connections, the executable ( -b ) involved, and the process ID ( -o ). Method 2: Using PowerShell (Test-NetConnection)