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 Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Cloudflare DNS Not Propagating After SSL Certificate Change
You changed an SSL certificate in Cloudflare, but DNS changes aren't showing up. This is a co...
Fix Docker Volume Permission Denied for Nginx
When running Nginx in a Docker container with a bind-mounted volume for static files, you might s...
How to Fix Git Clone Timeout Error Code 128
When you run git clone and see error: RPC failed; curl 56 OpenSSL SSL_read: Co...
Docker Desktop Engine Stopped After Update: Fixes
After a Docker Desktop update, you may see the engine fail to start. The UI shows a red status ba...
Issue queue
SitemapHow to Disable Hardware Acceleration in Chrome When Screen Is Black
Troubleshooting Remote Desktop Connection Errors
Resolve Docker Context Canceled with Symlinks
Docker Compose ENV Not Passed to Entrypoint: Fix
Troubleshoot Chrome Extension Permission Errors
How to Stop Windows Explorer from Restarting on Login
How to Fix Permission Denied in VS Code
Troubleshoot Windows 10 Shared Folder Access Denied
Windows 11 VS Code Source Control Not Working
Windows Update Service Won't Stop – How to Fix
Fix VS Code Permission Denied When Saving Workspace
Docker Desktop Auto-Start on Windows 11: 4 Methods
Troubleshooting Remote Desktop Connection Errors
Resolve Docker Context Canceled with Symlinks
Docker Compose ENV Not Passed to Entrypoint: Fix
Troubleshoot Chrome Extension Permission Errors
How to Stop Windows Explorer from Restarting on Login
How to Fix Permission Denied in VS Code
Troubleshoot Windows 10 Shared Folder Access Denied
Windows 11 VS Code Source Control Not Working
Windows Update Service Won't Stop – How to Fix
Fix VS Code Permission Denied When Saving Workspace
Docker Desktop Auto-Start on Windows 11: 4 Methods