How to Fix Cloudflare 521 Error Due to Proxy Issues
If you see a Cloudflare 521 error, the message usually says something like “Web server is down.” ...
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 Blue Screen After Update with System Restore
If you're seeing a blue screen after installing a Windows 11 update, System Restore can often...
Fix Nginx 'upstream connection refused' When Talking to PHP-FPM
You're seeing upstream connection refused in your Nginx error log, and your site...
Resolving Python Dependency Conflicts with Poetry Lock File
You're working on a Python project managed by Poetry, and after adding or updating a dependen...
Fix VS Code Git Authentication Failed with Two-Factor Auth
When you have two-factor authentication (2FA) enabled on your Git service (GitHub, GitLab, Bitbuc...
Fix Windows Update Service Stuck on Stopping
You try to stop the Windows Update service to troubleshoot an update issue, but it hangs on "...
Issue queue
SitemapHow to Stop Chrome Black Screen on Second Display
Chrome Print Error Access Violation Guide
How to Clear DNS Cache After Changing DNS Servers
Resolve PowerShell Permission Denied Errors in VS Code
Windows Update Error 0x80070002 Component Reset Guide
Cannot Access Network Share in Windows 10/11
Fix Docker Network Not Found Error
Resolve 'Externally Managed Environment' pip Error
Chrome Startup Crash: Registry Fix Guide
VS Code Save Permission Denied – Troubleshooting Guide
How to Avoid Git Timeout with Big Repositories
Docker Python Package Install Permission Error
Chrome Print Error Access Violation Guide
How to Clear DNS Cache After Changing DNS Servers
Resolve PowerShell Permission Denied Errors in VS Code
Windows Update Error 0x80070002 Component Reset Guide
Cannot Access Network Share in Windows 10/11
Fix Docker Network Not Found Error
Resolve 'Externally Managed Environment' pip Error
Chrome Startup Crash: Registry Fix Guide
VS Code Save Permission Denied – Troubleshooting Guide
How to Avoid Git Timeout with Big Repositories
Docker Python Package Install Permission Error