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 ERR_CONNECTION_RESET on Chrome Mobile
When browsing on your phone, you might see the error ERR_CONNECTION_RESET in Chr...
Fix Bluetooth Not Showing in Device Manager on Windows 11
If you open Device Manager on Windows 11 and Bluetooth is completely absent—no adapter listed und...
Cloudflare Origin Certificate Not Working After Renewal: Fixes
If your Cloudflare origin certificate stops working after renewal, you are likely seeing SSL erro...
How to Fix Python Memory Errors on Large Files in Windows
If you're getting a MemoryError when trying to open or process a large file in P...
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
SitemapHow to Fix Firefox Secure Connection Failed on Android
Solving 'Fatal: Remote Origin Already Exists' in Git
Stop Chrome Crash on Startup Due to Malware
Resolve Cloudflare 521 Error on Wildcard Domains
Docker Nginx 502 Bad Gateway After Restart Fix
How to Resolve Docker Port Conflicts
Handling Large Files in Python on Mac Without Memory Errors
Resolve Git Authentication Errors in Visual Studio Code
How to Fix Git Merge Unrelated Histories Error
Fix Docker Container Exiting Due to Network Issues
Resolving Cloudflare 521 Errors
Windows 11 Update Frozen at 0% – Fix Guide
Solving 'Fatal: Remote Origin Already Exists' in Git
Stop Chrome Crash on Startup Due to Malware
Resolve Cloudflare 521 Error on Wildcard Domains
Docker Nginx 502 Bad Gateway After Restart Fix
How to Resolve Docker Port Conflicts
Handling Large Files in Python on Mac Without Memory Errors
Resolve Git Authentication Errors in Visual Studio Code
How to Fix Git Merge Unrelated Histories Error
Fix Docker Container Exiting Due to Network Issues
Resolving Cloudflare 521 Errors
Windows 11 Update Frozen at 0% – Fix Guide