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 notesHow to Fix Windows 11 Blue Screen After Update
If you're seeing a blue screen (BSOD) right after installing a Windows 11 update, you're ...
How to Downgrade Node.js for Package Compatibility
You install a package and get errors like requires Node.js >= 16, but you have 18...
How to Fix Error 0x80070005 in Windows 11 (Access Denied)
If you see error 0x80070005 on Windows 11, it usually means the system or an app couldn't acc...
Fix NET::ERR_CERT_AUTHORITY_INVALID in Chrome
When Chrome shows 'NET::ERR_CERT_AUTHORITY_INVALID', it means the browser cannot verify t...
Fix Windows 10 Shared Folder Access Denied Error
You set up a shared folder on Windows 10, but when you try to access it from another computer, yo...
Issue queue
SitemapHow to Fix 'Git Remote Origin Already Exists' Error When Cloning
Fix Chrome Status Access Violation by Resetting Settings
Creating a Docker Network When It's Missing
Firefox Secure Connection Failed Not Loading Fix
Fix Git SSL Certificate Problem with Proxy: Unable to Get Local Issuer
Resolve 'Permission Denied' in Visual Studio Code
Resolve Windows 11 Blue Screen Caused by Cumulative Update
Fix Docker Volume Permission Denied for Non-Root User
Fix 521 Origin Connection Error After Server Update
Fix 'npm run build Error Cannot Find Module'
Windows Update 0x80070005 Troubleshooting Guide
Setting Up Cloudflare Wildcard Subdomains for Multiple Sites
Fix Chrome Status Access Violation by Resetting Settings
Creating a Docker Network When It's Missing
Firefox Secure Connection Failed Not Loading Fix
Fix Git SSL Certificate Problem with Proxy: Unable to Get Local Issuer
Resolve 'Permission Denied' in Visual Studio Code
Resolve Windows 11 Blue Screen Caused by Cumulative Update
Fix Docker Volume Permission Denied for Non-Root User
Fix 521 Origin Connection Error After Server Update
Fix 'npm run build Error Cannot Find Module'
Windows Update 0x80070005 Troubleshooting Guide
Setting Up Cloudflare Wildcard Subdomains for Multiple Sites