Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
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 WiFi with Internet but No Network Access
After a network reset, some Windows 11 users find their WiFi connects but shows "No internet&...
How to Fix Black Screen After Enabling Hardware Acceleration in Chrome
You enable hardware acceleration in Chrome to improve performance, and suddenly the screen goes b...
Fix Error 0x80070080: Windows Update Reset Permissions
Error 0x80070080 (access denied) during Windows Update usually means the system lacks proper perm...
Fix Python Permission Denied When Installing Package in Virtual Environment
You activate your Python virtual environment, run pip install somepackage, and get a...
Git Detached HEAD vs Attached HEAD: What It Means and How to Fix
If you've seen the message "You are in 'detached HEAD' state" while using Git...
Issue queue
SitemapMac Chrome NET::ERR_CERT_AUTHORITY_INVALID Solution
Troubleshoot Chrome Status Access Violation Error
How to Resolve Cloudflare 522 Due to Server Resource Exhaustion
Docker Compose Env Variable Missing: How to Fix
Windows 11 Update Stuck at 0%: Permission Denied Fix
Fix ERR_NAME_NOT_RESOLVED After Chrome Update
How to Troubleshoot Cloudflare Origin Certificates
How to Resolve Git Remote Origin Already Exists
Troubleshooting Bluetooth Error 0x00000001 in Windows 11
Troubleshoot Windows 11 Bluetooth Discovery Issues
How to Fix VS Code Git Detection Issues
Fix ERR_NAME_NOT_RESOLVED DNS Configuration Error
Troubleshoot Chrome Status Access Violation Error
How to Resolve Cloudflare 522 Due to Server Resource Exhaustion
Docker Compose Env Variable Missing: How to Fix
Windows 11 Update Stuck at 0%: Permission Denied Fix
Fix ERR_NAME_NOT_RESOLVED After Chrome Update
How to Troubleshoot Cloudflare Origin Certificates
How to Resolve Git Remote Origin Already Exists
Troubleshooting Bluetooth Error 0x00000001 in Windows 11
Troubleshoot Windows 11 Bluetooth Discovery Issues
How to Fix VS Code Git Detection Issues
Fix ERR_NAME_NOT_RESOLVED DNS Configuration Error