
Fix 'Port Already in Use' Error with Windows Defender Firewall
You try to start a local service or application, and it fails with an error like 'port already in...

You try to start a local service or application, and it fails with an error like 'port already in...

When Windows Defender fails to start or update, you might see an error like 'port already allocat...

You try to activate Windows, but get an error saying the activation file is locked or the registr...

If Windows Security settings become misconfigured—perhaps after a third-party antivirus installat...

If Windows Defender is disabled on your system—often due to group policy, third-party antivirus, ...

If you're stuck in a Windows Terminal login loop or your settings aren't syncing across devices, ...