Nginx Upstream Connection Refused: Diagnosis and Fixes
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesPython Virtual Environment Not Activating on Mac: Fixes
You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...
Git index.lock File Exists Even After Deleting: Fixes
You delete the .git/index.lock file, but Git still says it exists. This can happen d...
How to Change npm Directory to Avoid Permission Denied
If you've seen "EACCES: permission denied" when running npm install -g, ...
Docker Container Exits Immediately with Exit Code 137
You start a Docker container, and it exits almost immediately with exit code 137. This usually me...
Fix Nginx Permission Denied on Socket File
When Nginx throws a "permission denied" error for a socket file, the web server can't...
Issue queue
SitemapHow to Disable IPv6 on Windows 11 to Fix No Internet
npm install EACCES: Fix Incorrect Node Ownership
Fix Nginx Upstream Connection Refused Behind Cloudflare
Fix pnpm Permission Denied Errors on macOS
Chrome Status Access Violation: Causes and Fixes
Nginx Redirect Loop Not Working: Causes and Fixes
Cloudflare SSL Full vs Flexible: Troubleshooting Mixed Content & Errors
Windows 11 Update Blue Screen Error Code Fix
Fix Nginx Redirect Loop with Cloudflare
Fix Chrome Sync Not Working Due to Proxy Settings
Firefox Secure Connection Failed: How to Fix
Nginx 502 Upstream Connection Refused Guide
npm install EACCES: Fix Incorrect Node Ownership
Fix Nginx Upstream Connection Refused Behind Cloudflare
Fix pnpm Permission Denied Errors on macOS
Chrome Status Access Violation: Causes and Fixes
Nginx Redirect Loop Not Working: Causes and Fixes
Cloudflare SSL Full vs Flexible: Troubleshooting Mixed Content & Errors
Windows 11 Update Blue Screen Error Code Fix
Fix Nginx Redirect Loop with Cloudflare
Fix Chrome Sync Not Working Due to Proxy Settings
Firefox Secure Connection Failed: How to Fix
Nginx 502 Upstream Connection Refused Guide