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 notesDocker Container Exits Immediately: Diagnosing Out of Memory
You start a Docker container and it exits within seconds. The logs show nothing obvious, or they ...
Fix Cloudflare 521 Error: SSL Configuration Steps
If you see a Cloudflare 521 error, it means Cloudflare can't establish a TCP connection to yo...
How to Fix Windows Update Service Not Running After Update
After a Windows update, you might find that the Windows Update service itself stops working. This...
Git Merge Conflict: Keep Both Files Instead of One
When you run git merge and get a conflict, Git stops and marks the conflicting files...
Python Requests: Setting Timeout for POST Requests
When your Python script makes a POST request to an external API or web service, a slow or unrespo...
Issue queue
SitemapHow to Fix Docker Compose Environment Variable Override Issues
Fix VS Code Git Authentication Failed Keychain Error
Fix Chrome Startup Crash via Task Manager
Docker Engine Startup Checklist
How to Clear DNS Cache After Changing DNS Servers
Fix Cloudflare 521 Error: Setup and Connection Guide
Docker Compose Port Already Allocated: Checklist
How to Fix Chrome Sync for Family Link Managed Accounts
How to Fix 'No Space Left on Device' in Docker on Ubuntu
Troubleshooting Cloudflare SSL Full Strict Errors
Docker Disk Full: Cleanup Steps and Fixes
Troubleshoot Group Policy Blocking Remote Desktop
Fix VS Code Git Authentication Failed Keychain Error
Fix Chrome Startup Crash via Task Manager
Docker Engine Startup Checklist
How to Clear DNS Cache After Changing DNS Servers
Fix Cloudflare 521 Error: Setup and Connection Guide
Docker Compose Port Already Allocated: Checklist
How to Fix Chrome Sync for Family Link Managed Accounts
How to Fix 'No Space Left on Device' in Docker on Ubuntu
Troubleshooting Cloudflare SSL Full Strict Errors
Docker Disk Full: Cleanup Steps and Fixes
Troubleshoot Group Policy Blocking Remote Desktop