Cloudflare Error 521: Web Server Down Checklist
Cloudflare error 521 means your origin web server refused the connection. This is not a Cloudflar...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Windows 11 Bluetooth Error 0x00000001
If you see error code 0x00000001 when trying to turn on Bluetooth or pair a device in Windows 11,...
Fixing pnpm EINTEGRITY Integrity Check Failures
When running pnpm install, you may encounter ERR! code EINTEGRITY. This...
Fix VS Code IntelliSense Not Showing Suggestions
You're typing code in VS Code, expecting autocomplete suggestions, but nothing appears. This ...
How to Fix Firefox Secure Connection Failed with VPN
You're using a VPN and Firefox suddenly shows 'Secure Connection Failed' on sites tha...
Fix Nginx 502 Bad Gateway on Docker Ubuntu
You're running Nginx as a reverse proxy inside Docker on Ubuntu, and suddenly you see
Issue queue
SitemapPython Dependency Conflict Troubleshooting Guide
Taskbar Icons Disappeared? Restore Them After Crash
Understanding Git Detached vs Attached HEAD
How to Resolve Cloudflare Wildcard Permissions Denied
How to Fix Windows Security Not Starting on Windows 11
Fix Windows 11 Upgrade Assistant Not Completing
Why Your Nginx Config Test Fails
Fix VS Code Breakpoint Not Hit in Docker Container
How to Replace Cloudflare Origin Cert with Let's Encrypt
Fix Stubborn Git index.lock File Not Deleting
Git Permission Denied in VS Code: Troubleshooting Guide
Fixing node-sass Build Failures on macOS
Taskbar Icons Disappeared? Restore Them After Crash
Understanding Git Detached vs Attached HEAD
How to Resolve Cloudflare Wildcard Permissions Denied
How to Fix Windows Security Not Starting on Windows 11
Fix Windows 11 Upgrade Assistant Not Completing
Why Your Nginx Config Test Fails
Fix VS Code Breakpoint Not Hit in Docker Container
How to Replace Cloudflare Origin Cert with Let's Encrypt
Fix Stubborn Git index.lock File Not Deleting
Git Permission Denied in VS Code: Troubleshooting Guide
Fixing node-sass Build Failures on macOS