How to Fix Cloudflare Error 521: Web Server Is Down
When you see Cloudflare error 521, it means your browser reached Cloudflare, but Cloudflare could...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Windows Security High Memory Usage (MsMpEng.exe)
You open Task Manager and see Windows Security (the process is MsMpEng.exe) using 500 MB or more ...
GitLab Runner Stuck Pending After Upgrade: Fixes
After upgrading GitLab Runner, you may see jobs stuck in pending state. This usually happens beca...
Fix Windows Defender Real-Time Protection Turning Off
If you see a notification that Windows Defender real-time protection is off, or it keeps turning ...
How to Fix Windows Security Service Not Running
If you see an error that the Windows Security service is not running, the Security Center or Wind...
Fix Windows Defender Connection Refused on Windows 10
When you see "connection refused" while using Windows Defender on Windows 10, it usually means th...
Issue queue
SitemapReset Windows Defender via Command Line
Windows 10 Microsoft Store Blank Screen Fix
Fix Windows Security Not Working in Ubuntu VM
How to Break the Cloudflare SSL Redirect Loop
Windows Update Access Denied: Run as Admin Guide
Sync Windows Security Settings Across Multiple PCs
Fix Outlook Stuck on Loading Profile (outlook.exe)
How to Set Up Windows Security for Maximum Protection
Fix 0x80070643 Update Error on Windows 10/11
How to Stop Antimalware Service Executable High CPU
Windows Defender Configuration Settings Guide
Troubleshooting PostgreSQL Connection Refused Error
Windows 10 Microsoft Store Blank Screen Fix
Fix Windows Security Not Working in Ubuntu VM
How to Break the Cloudflare SSL Redirect Loop
Windows Update Access Denied: Run as Admin Guide
Sync Windows Security Settings Across Multiple PCs
Fix Outlook Stuck on Loading Profile (outlook.exe)
How to Set Up Windows Security for Maximum Protection
Fix 0x80070643 Update Error on Windows 10/11
How to Stop Antimalware Service Executable High CPU
Windows Defender Configuration Settings Guide
Troubleshooting PostgreSQL Connection Refused Error