Fix Nginx Upstream Connection Refused Timeout Error
When Nginx returns 502 Bad Gateway or logs upstream connection refused timeout...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Cloudflare DNS Propagation Taking Too Long
You updated DNS records in Cloudflare but changes still aren't live hours later. This is frus...
How to Use a Cloudflare DNS Propagation Checker Tool
After you change a DNS record in Cloudflare, it takes time for the update to spread across the in...
Fix 'Windows Cannot Access Shared Folder' After Update
After a recent Windows update, you might see the error “Windows cannot access \\computername\shar...
Fix Windows Security App Not Opening Command Prompt
You click the Windows Security icon or try to launch it from Settings, but nothing happens. Or pe...
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...
Issue queue
SitemapERR_CONNECTION_RESET: Firewall Blocking Chrome Guide
Troubleshooting Docker No Space Left on Device (Devicemapper)
Fix Chrome Black Screen Flickering from Hardware Acceleration
Git Unrelated Histories Merge Error Fix
Fix Windows Update Service Not Running After Update
Nginx 502 Upstream Connection Refused Guide
How to Fix Git Large File Errors When Not Using LFS
Fix 'nginx -t test failed no such file or directory' Error
How to Create and Install a Cloudflare Origin Certificate
How to Fix 'Git Remote Origin Already Exists' and Permission Denied
Step-by-Step Git LFS Migration and Push
Fix Chrome Freezing on Startup on Mac
Troubleshooting Docker No Space Left on Device (Devicemapper)
Fix Chrome Black Screen Flickering from Hardware Acceleration
Git Unrelated Histories Merge Error Fix
Fix Windows Update Service Not Running After Update
Nginx 502 Upstream Connection Refused Guide
How to Fix Git Large File Errors When Not Using LFS
Fix 'nginx -t test failed no such file or directory' Error
How to Create and Install a Cloudflare Origin Certificate
How to Fix 'Git Remote Origin Already Exists' and Permission Denied
Step-by-Step Git LFS Migration and Push
Fix Chrome Freezing on Startup on Mac