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 Nginx 502 Bad Gateway in Docker Alpine
You have an Nginx container running on Alpine Linux, and it returns a 502 Bad Gateway. This usual...
Fix ERR_NAME_NOT_RESOLVED with ipconfig /flushdns in Chrome
When Chrome shows ERR_NAME_NOT_RESOLVED, it means the browser couldn't trans...
How to Show Hidden Icons on Taskbar in Windows 10
You may notice that some app icons in the system tray (notification area) are hidden behind an up...
How to Fix Cloudflare 521 Error During Setup
If you see a 521 error after setting up Cloudflare, it means your origin server refused the conne...
Docker Desktop Engine Troubleshooting Checklist
When Docker Desktop fails to start or the engine stops responding, the cause is often a misconfig...
Issue queue
SitemapHow to Fix npm install ENOENT Error
Fix Windows Update Error 0x80070002 on Windows 11
How to Stop Docker Container from Exiting Immediately
Manual index.lock Deletion in Git
Git Non Fast Forward Push Error Troubleshooting
Windows Security Keeps Crashing? Here's How to Fix
Windows Update Service Stopped: System Restore Fix
Fix 'pip install externally managed environment' Error
Nginx Permission Denied Upstream Error Fix
Stop Explorer.exe from Crashing and Restarting
Mac VS Code Terminal Not Responding – Fixes
Resolving Node Version Requirement Errors
Fix Windows Update Error 0x80070002 on Windows 11
How to Stop Docker Container from Exiting Immediately
Manual index.lock Deletion in Git
Git Non Fast Forward Push Error Troubleshooting
Windows Security Keeps Crashing? Here's How to Fix
Windows Update Service Stopped: System Restore Fix
Fix 'pip install externally managed environment' Error
Nginx Permission Denied Upstream Error Fix
Stop Explorer.exe from Crashing and Restarting
Mac VS Code Terminal Not Responding – Fixes
Resolving Node Version Requirement Errors