Fix 'Windows Defender Firewall Has Blocked' Error
You see a notification that Windows Defender Firewall has blocked an app or feature. This usually...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFileZilla FTP Connection Timed Out: Troubleshooting Checklist
You're trying to connect with FileZilla but keep getting a "Connection timed out" error. This usu...
Fix Windows Activation slui.exe Not Opening
When you try to activate Windows using the Settings app or a command, slui.exe (Software Licensin...
Fix Task Scheduler Token Expired Credentials Error
When a scheduled task fails with an error about expired credentials or a token that is no longer ...
Chrome Startup Troubleshooting Checklist: Fix Browser That Won't Open
If Chrome fails to start—whether it crashes, hangs, or shows a blank screen—the problem is often ...
How to Fix Windows Update Service Not Running
When Windows Update fails to check for or install updates, a common cause is that the Windows Upd...
Topic paths
Quick titles
How to Fix Windows Activation 502 Bad Gateway ErrorCommand Prompt Settings Won't Save: Troubleshooting GuideFix Microsoft Teams Service Unavailable Error for Individual UserResolve Port Already Allocated Using netstatTroubleshoot Chrome Profile Permission ErrorWindows Search Connection Refused: Service Not Running FixTroubleshoot Windows Defender ErrorsOneDrive Sync Conflict Troubleshooting Checklist