Fix 'Port Already Allocated' Error in Windows Defender on Windows 10
You may see an error like "Windows Defender Firewall cannot use port X because it is already allo...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Search High Memory Usage and Error 0x80040c
If you see error 0x80040c in Windows Search or notice high memory usage from SearchIndexer.exe, t...
Fix Visual Studio Installer Error 0x80070643
You're trying to install or update Visual Studio, but the installer fails with error code 0x80070...
Fix Windows Defender Service Not Starting with Permission Denied
If you see 'Windows Defender service not starting – permission denied' when trying to enable Micr...
Fix Windows Activation Failed After Hardware Change
If you see a "Windows activation failed" message after upgrading your PC hardware, you're not alo...
Fix Windows Defender Token Expired Preventing Service Start
You see 'Token expired' in the Windows Defender event log or a notification that the service didn...
Topic paths
Quick titles
Stop Windows SSL Certificate Warning PopupsGit SSL Certificate Self-Signed Fix GuideHow to Fix Proxy Connection Reset in ChromeResolve Cloudflare 522 Timeout with NginxFix Page Not Found in Microsoft StoreHow to Fix 502 Bad Gateway in Windows SearchHow to Sync Windows Activation Across Multiple DevicesWindows Security 502 Bad Gateway Fix