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...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Fix Firefox Secure Connection Failed Error
When Firefox shows 'Secure Connection Failed' and won't load a site, it usually means...
Fix Docker Registry Authentication Failed Access Denied
You try to pull or push an image from a private Docker registry and get an error like authe...
Fix Nginx Upstream Connection Refused Behind Cloudflare
If you see upstream connection refused in your Nginx error logs while using Cloudfla...
Fix Error 0x80070080: Windows Update Reset Permissions
Error 0x80070080 (access denied) during Windows Update usually means the system lacks proper perm...
Fix Wi-Fi Adapter Not Working in Windows 11: No Internet
You connect to Wi-Fi in Windows 11, but the icon shows a globe with “No internet.” The adapter mi...
Issue queue
SitemapResolving Nginx Permission Denied Errors (www-data)
Fix Nginx Upstream Connection Refused Timeout Error
Stop Edge Sync Sign-In Loop with These Fixes
Chrome Update Causing Black Screen? Disable Hardware Acceleration
Mac Chrome Freezes on Opening: How to Fix
How to Fix Chrome Black Screen from Hardware Acceleration
Resolve Cloudflare 521 Error on Wildcard Domains
Docker PHP-FPM 502 Error Troubleshooting Guide
Fix Chrome Certificate Error: Invalid Authority & Date/Time Issue
Troubleshooting pnpm install Failure
Fix Chrome ERR_CONNECTION_RESET Caused by VPN
Setting Up Git LFS for Large Files
Fix Nginx Upstream Connection Refused Timeout Error
Stop Edge Sync Sign-In Loop with These Fixes
Chrome Update Causing Black Screen? Disable Hardware Acceleration
Mac Chrome Freezes on Opening: How to Fix
How to Fix Chrome Black Screen from Hardware Acceleration
Resolve Cloudflare 521 Error on Wildcard Domains
Docker PHP-FPM 502 Error Troubleshooting Guide
Fix Chrome Certificate Error: Invalid Authority & Date/Time Issue
Troubleshooting pnpm install Failure
Fix Chrome ERR_CONNECTION_RESET Caused by VPN
Setting Up Git LFS for Large Files