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 notesFix Windows 11 Wi-Fi No Internet by Disabling IPv6
If your Windows 11 PC connects to Wi-Fi but shows 'No internet' while other devices work ...
Fix Firefox Secure Connection Failed Not Loading
If Firefox shows a “Secure Connection Failed” error and won’t let you load a site, it usually mea...
Windows Security App Not Opening: Practical Fixes
If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...
Fix Wi-Fi No Internet on Windows 11 Without Restarting Router
You connect to Wi-Fi, the icon shows internet access, but browsers say no internet. Restarting th...
VS Code Git Changes Not Detected After Clone: Fixes
You clone a repository, open it in VS Code, but the Source Control panel shows no changes—even th...
Issue queue
SitemapTroubleshoot Windows Search Indexing Issues with New Files
VS Code Terminal Won't Open Troubleshooting Guide
Windows Taskbar Icons Disappeared After Driver Update Fix
Troubleshooting npm package.json Not Found Error on Linux
How to Set Up a Cloudflare Origin Certificate
Fix ERR_CONNECTION_RESET in Chrome: Step-by-Step
Firefox DNS Error Troubleshooting Guide
How to Enable Windows Defender Real-Time Protection via Group Policy
Cloudflare Wildcard Subdomain Redirect Loop: How to Fix
Windows Update Component Cleanup Error 0x800f081f Guide
How to Resolve Git Unrelated Histories Error
Fix Docker Pull Access Denied: Step-by-Step Guide
VS Code Terminal Won't Open Troubleshooting Guide
Windows Taskbar Icons Disappeared After Driver Update Fix
Troubleshooting npm package.json Not Found Error on Linux
How to Set Up a Cloudflare Origin Certificate
Fix ERR_CONNECTION_RESET in Chrome: Step-by-Step
Firefox DNS Error Troubleshooting Guide
How to Enable Windows Defender Real-Time Protection via Group Policy
Cloudflare Wildcard Subdomain Redirect Loop: How to Fix
Windows Update Component Cleanup Error 0x800f081f Guide
How to Resolve Git Unrelated Histories Error
Fix Docker Pull Access Denied: Step-by-Step Guide