Fix Nginx Upstream Connection Refused in Proxy Pass
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 notesWindows 11 Update Stuck at 0% Due to Corrupt Files: Fixes
You start a Windows 11 update, and it hangs at 0% for minutes or hours. Corrupt system files are ...
Windows Security App Won't Open in Safe Mode: Fixes
If you’re in Safe Mode and the Windows Security app refuses to open—showing a blank window, crash...
Windows 11 Update Stuck at 0%: Registry Fix Guide
You click 'Check for updates' and see the progress bar stuck at 0% for minutes or hours. ...
Fix Cloudflare Origin Certificate Not Trusted by Browser
You've set up Cloudflare with an origin certificate, but browsers show a warning that the cer...
Fix Windows Update Error 0x80070002 on Windows 11
If you see error 0x80070002 when running Windows Update on Windows 11, it usually means Windows c...
Issue queue
SitemapEnable Windows Defender Real-Time Protection: Step-by-Step
Troubleshoot Windows Update Error 0x80070002
Docker Permission Denied on Pull: Solutions
Fix Cloudflare Wildcard Subdomain Page Rule Not Working
How to Update Git Remote Origin URL
How to Resolve Docker Network Not Found
Cloudflare DNS Setup Propagation Not Completing: Fixes
Fix Git Clone Timeout on Linux
Handling Python Requests Timeout on Slow Networks
How to Enable Greyed Out Defender Real-Time Protection
Fix Windows Defender Real-Time Protection Disabled by Malware
Windows Explorer Not Responding – Troubleshooting Tips
Troubleshoot Windows Update Error 0x80070002
Docker Permission Denied on Pull: Solutions
Fix Cloudflare Wildcard Subdomain Page Rule Not Working
How to Update Git Remote Origin URL
How to Resolve Docker Network Not Found
Cloudflare DNS Setup Propagation Not Completing: Fixes
Fix Git Clone Timeout on Linux
Handling Python Requests Timeout on Slow Networks
How to Enable Greyed Out Defender Real-Time Protection
Fix Windows Defender Real-Time Protection Disabled by Malware
Windows Explorer Not Responding – Troubleshooting Tips