
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...
Software troubleshooting desk

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

If you've signed into Windows with your Microsoft account and notice that Defender settings—like ...

If you see a 'Module not found' error in Windows Terminal, it usually means a PowerShell or WSL p...

You open Command Prompt to run MpCmdRun.exe or Get-MpPreference and get...

When Windows Defender fails to sync with Microsoft 365, you might see alerts like "Can't connect ...

When you double-click Windows Security and nothing opens, or you see error 0x80073cfc, it usually...