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 notesFix Node Sass Build Failed with Visual Studio Build Tools
When you see node-sass build failed during an npm install, it usually means the nati...
Fix Windows 11 WiFi No Internet Due to Proxy Settings
If your Windows 11 laptop shows full WiFi bars but browsers say “No internet,” a common culprit i...
Fix 'port already allocated' for Nginx in Docker Compose
You're starting your Docker Compose setup with Nginx, and you see "port is already alloca...
Fix Nginx 502 Bad Gateway with Docker and PHP-FPM
You have a Docker setup with Nginx proxying to a PHP-FPM container, and you're getting a 502 ...
Fix ERR_NAME_NOT_RESOLVED with ipconfig /flushdns in Chrome
When Chrome shows ERR_NAME_NOT_RESOLVED, it means the browser couldn't trans...
Issue queue
SitemapHow to Fix "docker context canceled" on Mac
Fix Python Virtual Environment Not Activating on Mac
Nginx Permission Denied for Root Directory Fix
Chrome Black Screen After Disabling Hardware Acceleration Fix
Fix 'npm permission denied' in VS Code Terminal
Troubleshoot Windows Search Index Failures
Windows 11 Update Blue Screen: Recovery Environment Fixes
Docker Compose Not Reading Shell Environment Variables
Fix VS Code Source Control Not Detecting Changes After Branch Switch
Resolve Git Detached HEAD in SourceTree
ERR_NAME_NOT_RESOLVED Fix Using Command Prompt
Resolve 'Unable to Get Local Issuer' in Git on Ubuntu
Fix Python Virtual Environment Not Activating on Mac
Nginx Permission Denied for Root Directory Fix
Chrome Black Screen After Disabling Hardware Acceleration Fix
Fix 'npm permission denied' in VS Code Terminal
Troubleshoot Windows Search Index Failures
Windows 11 Update Blue Screen: Recovery Environment Fixes
Docker Compose Not Reading Shell Environment Variables
Fix VS Code Source Control Not Detecting Changes After Branch Switch
Resolve Git Detached HEAD in SourceTree
ERR_NAME_NOT_RESOLVED Fix Using Command Prompt
Resolve 'Unable to Get Local Issuer' in Git on Ubuntu