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Docker Container Exits Immediately: How to Find Logs and Fix It - Troubleshooting Nginx proxy_pass Connection Refused-How to Fix Cloudflare Error 521: Origin Server Unreachable

2026-07-28 06:33:33
Docker Container Exits Immediately: How to Find Logs and Fix It - Troubleshooting Nginx proxy_pass Connection Refused-How to Fix Cloudflare Error 521: Origin Server Unreachable

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

Next references

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