Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Wi-Fi Adapter Not Working in Windows 11: No Internet
You connect to Wi-Fi in Windows 11, but the icon shows a globe with “No internet.” The adapter mi...
VS Code IntelliSense Not Working for Java: Fix Guide
You open a Java file in VS Code, start typing, and get no code completion, no parameter hints, no...
Fix ERR_CONNECTION_RESET Caused by Firewall Blocking Chrome
If you see ERR_CONNECTION_RESET in Chrome, it usually means something interrupte...
How to Set npm Prefix to Avoid Permission Denied Errors
If you've seen EACCES: permission denied when running npm install -g
Fix Firefox Secure Connection Failed DNS Error
You try to visit a website in Firefox and see 'Secure Connection Failed' with an error li...
Topic paths
Quick titles
Windows 11 Update Stuck: Troubleshooting ChecklistDNS Probe Finished NXDOMAIN: Meaning and FixesCloudflare SSL Full vs Flexible: Fixing Mixed Content and ErrorsWindows Explorer Not Responding? Here's How to Fix ItTroubleshooting VS Code IntelliSense FailuresWindows Search Indexing Setup: A Practical GuideTroubleshooting Cloudflare Wildcard SSL IssuesFix WiFi Connected But No Internet on Windows 11 Using Netsh