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 Git SSL Certificate Problem on macOS: Unable to Get Local Issuer
If you're seeing fatal: unable to access 'https://...': SSL certificate problem...
How to Fix Git Clone Timeout Error Code 128
When you run git clone and see error: RPC failed; curl 56 OpenSSL SSL_read: Co...
Node.js Heap Out of Memory in Production: Practical Fixes
You're running a Node.js application in production when it crashes with FATAL ERROR: In...
Cloudflare DNS Not Propagating to All Nameservers: Common Fixes
You changed a DNS record in Cloudflare, but some resolvers still show the old value while others ...
How to Troubleshoot Remote Desktop Connection Issues
Remote Desktop (RDP) lets you control another computer over a network. When it fails, you usually...
Topic paths
Quick titles
Resolve ERR_NAME_NOT_RESOLVED QuicklyHow to Resolve Error 0x80070005 in Windows 11Docker No Space Left on Device Cleanup GuideHow to Repair a Corrupt Chrome ProfileFix Windows 11 Bluetooth Pairing ProblemsGit SSL Certificate Issue: Step-by-Step TroubleshootingWhy Chrome Freezes at Launch and What to DoVS Code Source Control Not Detecting Changes After Git Reinstall