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 notesHow to Fix Windows Update Error 0x80070002
Error 0x80070002 often appears when Windows Update tries to install an update but can't find ...
How to Fix Cloudflare 521 Error with Wildcard Subdomains
If you're seeing a Cloudflare 521 error on a wildcard subdomain (e.g., *.example.com), the or...
Fix 'Externally Managed Environment' Error on Linux
If you're on a modern Linux distribution (Ubuntu 23.04+, Debian 12+, Fedora 38+, etc.) and ge...
Windows Security App Not Opening: Practical Fixes
If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...
Fix 'pip externally managed environment' Error in Python 3.12
If you're using Python 3.12 on a modern Linux distribution (like Fedora 38+, Ubuntu 23.04+, o...
Issue queue
SitemapFix Python Dependency Conflicts After an Update
Ubuntu VS Code Git Detection Fix
Fix ERR_CONNECTION_RESET Caused by Firewall Blocking Chrome
How to Fix Nginx Load Balancer Refused Connections
Taskbar Icons Missing After Sign Out: Fixes
Fix Node.js Heap Out of Memory Error in PM2
Docker Nginx 502 Error MySQL Troubleshooting
How to Resolve Windows Update Error 0x80070005
Troubleshooting pnpm Stuck on Resolving Dependencies
Stop Nginx Redirect Loop: Step-by-Step Guide
Fix Windows 11 Bluetooth Driver Not Working
How to Fix DNS Probe Errors via Router Settings
Ubuntu VS Code Git Detection Fix
Fix ERR_CONNECTION_RESET Caused by Firewall Blocking Chrome
How to Fix Nginx Load Balancer Refused Connections
Taskbar Icons Missing After Sign Out: Fixes
Fix Node.js Heap Out of Memory Error in PM2
Docker Nginx 502 Error MySQL Troubleshooting
How to Resolve Windows Update Error 0x80070005
Troubleshooting pnpm Stuck on Resolving Dependencies
Stop Nginx Redirect Loop: Step-by-Step Guide
Fix Windows 11 Bluetooth Driver Not Working
How to Fix DNS Probe Errors via Router Settings