Fix Windows Defender Connection Refused via Group Policy
If you see a "connection refused" error when trying to open Windows Defender Security Center or r...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Search Returning 404 Not Found Error
When you search for a file or app in Windows and click a result, you may see a ‘404 Not Found’ er...
How to Fix Windows Defender 502 Bad Gateway Error
If you see a '502 bad gateway' error in Windows Defender, it usually means the security service c...
Outlook Permission Denied Shared Mailbox Fix
When you try to open a shared mailbox in Outlook and see 'permission denied', it usually means th...
Windows Activation Version Mismatch: IT Admin Checklist
When a Windows client or server reports a version mismatch during activation, it usually means th...
How to Fix Windows Defender Error 0x800704ec
When you try to open Windows Defender (now called Microsoft Defender Antivirus) and see error cod...
Topic paths
Quick titles
Fix Chrome 'Permission Denied' Error on Windows 10How to Fix Missing File Activation Error in WindowsWindows 10 Port Conflict: Find and Kill ProcessResolve Access Denied in MySQL WorkbenchHow to Increase Composer Memory Limit via Environment VariableFix Chrome Profile Dependency ErrorsOneDrive Command Not Found Error GuideCommand Prompt Missing in Windows Terminal? Fix It