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Fixing Cloudflare 521 Error After Server Restart - How to Fix Chrome SSL Certificate Error Caused by Wrong System Clock-Nginx Upstream Connection Refused Fix Guide

Updated 2026-07-28 12:21:48developer-tools
Fixing Cloudflare 521 Error After Server Restart - How to Fix Chrome SSL Certificate Error Caused by Wrong System Clock-Nginx Upstream Connection Refused Fix Guide
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.

More repair notes

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