How to Fix Cloudflare 521 Error with Firewall Settings
If you see a 521 Web Server Is Down error when visiting your site through Cloudf...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Defender Real-Time Protection Not Turning On After Update
After a Windows Update, you might find that Windows Defender's real-time protection is stuck ...
Fix Edge Sync Stuck on Sign-In Loop
You open Microsoft Edge, try to sign in to sync your data, and it keeps looping back to the sign-...
Fix Chrome Status Access Violation in Safe Mode
If you see a 'status access violation' error in Chrome while in safe mode, it usually poi...
Fix Windows 11 Installation Assistant Stuck at 99% SFC Scan
You're upgrading to Windows 11 using the Installation Assistant, and it hangs at 99% while ru...
Fix VS Code Permission Denied When Not Admin
You try to save a file or install an extension in VS Code, and get a "permission denied" ...
Topic paths
Quick titles
How to Stop Antivirus from Blocking Edge SyncERR_CONNECTION_RESET Chrome Error After Rebooting RouterHow to Resolve Git Clone Timed Out Error on WindowsHow to Fix Python UnicodeDecodeError on WindowsWindows Explorer Keeps Restarting After Login – Troubleshooting GuideHow to Fix 502 Bad Gateway with Nginx and Docker on UbuntuFix 'Permission Denied' in VS Code TerminalFix 521 Origin Connection Error After Server Update