Fixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Git SSL Certificate Problem: Unable to Get Local Issuer on GitHub
If you see fatal: unable to access 'https://github.com/...': SSL certificate proble...
Fix Chrome Certificate Error: Invalid Authority Registry on Windows
When browsing in Chrome, you may encounter a certificate error stating “invalid authority...
Fix Docker Compose Environment Variable Not Set on Build
You've defined environment variables in your docker-compose.yml under envi...
Nginx Upstream Connection Refused: Fixing localhost Errors
You set up an nginx reverse proxy to forward requests to a backend service on localhost, but ngin...
Fix 'nginx configuration test failed invalid parameter'
When running nginx -t to test configuration, seeing "nginx: [emerg] inva...
Topic paths
Quick titles
Cloudflare Origin Certificate Error After SSL Mode ChangeVS Code Can't Save File: Permission Denied TroubleshootingHow to Refresh VSCode Source Control DetectionHow to Fix 'python' Command Not Found in VS CodeAndroid Chrome DNS Probe NXDOMAIN FixTroubleshooting Bluetooth Error 0x00000001 in Windows 11Windows 11 Bluetooth Permission Problem GuideFix Chrome Extensions That Won't Load