How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesEdge Sync Not Syncing Passwords or Bookmarks: Fixes
You open Edge on another device and your saved passwords or bookmarks aren't there. Sync seem...
Fix Cloudflare Wildcard Subdomain Issues After SSL Change
If your wildcard subdomains (e.g., *.example.com) stop working after you change SSL/TLS settings ...
Understanding and Fixing Git Detached HEAD State
If you've seen the message You are in 'detached HEAD' state in Git, you ...
Windows Defender Real-Time Protection Troubleshooting Checklist
If Windows Defender real-time protection fails to turn on or keeps turning off, you may see warni...
Fix Git Merge Conflicts When Stash Changes Are Involved
You're mid-merge, and Git tells you there's a conflict. But you also have stashed changes...
Issue queue
SitemapFix Docker Build Context Canceled in VS Code
How to Solve NET::ERR_CERT_AUTHORITY_INVALID in Chrome at Work
How to Break the Windows Explorer Automatic Repair Cycle
Router Settings for ERR_NAME_NOT_RESOLVED
Fix Docker Permission Denied with Volumes and Bind Mounts
How to Resolve Port Binding Conflicts in Docker Compose
Windows 11 Update Hangs at 0%: Troubleshooter and Manual Fixes
How to Fix Bluetooth Driver Issues in Windows 11
Resolve Cloudflare 521 Origin Connection Error
How to Fix VS Code Permission Denied on Update
Fix Chrome Black Screen with Hardware Acceleration and Zoom
VS Code Remote Debugging: Breakpoint Not Hit Fix
How to Solve NET::ERR_CERT_AUTHORITY_INVALID in Chrome at Work
How to Break the Windows Explorer Automatic Repair Cycle
Router Settings for ERR_NAME_NOT_RESOLVED
Fix Docker Permission Denied with Volumes and Bind Mounts
How to Resolve Port Binding Conflicts in Docker Compose
Windows 11 Update Hangs at 0%: Troubleshooter and Manual Fixes
How to Fix Bluetooth Driver Issues in Windows 11
Resolve Cloudflare 521 Origin Connection Error
How to Fix VS Code Permission Denied on Update
Fix Chrome Black Screen with Hardware Acceleration and Zoom
VS Code Remote Debugging: Breakpoint Not Hit Fix