Fixing Nginx Upstream Connection Refused on Port 443
You see "upstream connection refused" in your Nginx error log when proxying requests to p...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Set Up a Wildcard Subdomain DNS Record in Cloudflare
If you need all subdomains (e.g., *.example.com) to point to the same IP or service, a wildcard D...
Nginx Permission Denied After Restart: Fixes That Work
After restarting nginx, you might see errors like connect() to unix:/var/run/php-fpm.sock f...
Fix Git Clone Connection Timed Out on GitHub Enterprise
When you run git clone on a GitHub Enterprise repository and see connection ti...
DNS Probe Finished NXDOMAIN: Fix When ipconfig /flushdns Fails
You're browsing normally and suddenly Chrome shows "DNS_PROBE_FINISHED_NXDOMAIN". You...
Fix Nginx 502 Bad Gateway in Docker Alpine
You have an Nginx container running on Alpine Linux, and it returns a 502 Bad Gateway. This usual...
Topic paths
Quick titles
How to Restart Windows Update Service in Windows 10Troubleshoot NET::ERR_CERT_AUTHORITY_INVALID in Chrome and EdgeFix Git Clone Connection Timed Out After 30 SecondsWindows 11 Update Stuck at 0%: Registry Fix GuideWindows Python Command Missing After Reinstall – TroubleshootingRust IntelliSense Not Working in VSCodeFix Externally Managed Error: Create Virtual EnvironmentWindows Security Repair Guide