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 notesFix Cloudflare SSL Full Strict Mixed Content Warning
You've enabled Cloudflare SSL/TLS encryption mode to Full (strict) and now see mixed content ...
Chrome Startup Crash When Opened from Task Manager
You click 'Run new task' in Task Manager, type 'chrome', hit Enter, and Chrome cr...
Python Virtual Environment Not Activating on Mac: Fixes
You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...
Fix Chrome Black Screen on Startup Due to Hardware Acceleration
If Chrome opens to a black screen after you launch it, the issue often involves hardware accelera...
How to Fix Windows Update Error 0x80070002
Windows Update error 0x80070002 usually appears when the system cannot find a required file durin...
Issue queue
SitemapFix Git Clone Timeout Errors with HTTP Timeout
Permanent Fix for Nginx Infinite Redirect
Docker Nginx 502: How to Diagnose and Fix Memory Limit Issues
Fix Docker Compose Port Allocation Errors
Nginx 502 Bad Gateway: Upstream Connection Refused Fix
Troubleshooting Cloudflare 522 Behind Load Balancer
Windows Update Error 0x80070005 Clean Boot Fix
Windows Update 0x80070002 Repair Guide
Resolve 'Missing Semicolon' in Nginx Config Test
Fix DNS Probe Finished NXDOMAIN on Router: Step-by-Step
Troubleshoot Error 0x80070035 When Accessing Network Share
VS Code Terminal Not Using Python Virtual Environment
Permanent Fix for Nginx Infinite Redirect
Docker Nginx 502: How to Diagnose and Fix Memory Limit Issues
Fix Docker Compose Port Allocation Errors
Nginx 502 Bad Gateway: Upstream Connection Refused Fix
Troubleshooting Cloudflare 522 Behind Load Balancer
Windows Update Error 0x80070005 Clean Boot Fix
Windows Update 0x80070002 Repair Guide
Resolve 'Missing Semicolon' in Nginx Config Test
Fix DNS Probe Finished NXDOMAIN on Router: Step-by-Step
Troubleshoot Error 0x80070035 When Accessing Network Share
VS Code Terminal Not Using Python Virtual Environment