Maxim Windows Firewall blocks all incoming traffic by default
Windows Defender Firewall is designed to protect your server by silently dropping unauthorized inbound connections. While this is exactly what you want for security, it means every application that needs to accept external connections — a web server, game server, VPN, or database — requires a manual firewall rule to let traffic through.
This guide covers the complete process using the built-in GUI. No PowerShell knowledge required. Each step is shown in order, so you can follow along directly on your server.
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Before You Begin
Confirm these four things before touching any firewall settings.
Common Ports on Windows Servers
The most frequently opened ports and their use cases.
How to verify the port is open
After creating the rule, confirm it’s listening using PowerShell or an external port checker. In PowerShell, run the command below — if the port shows LISTENING, the rule is working correctly.
netstat -an | findstr :25565For external testing: yougetsignal.com/tools/open-ports
