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Docker Container Exits Immediately with Exit Code 137 - Cloudflare Wildcard DNS Setup for Multiple Sites-How to Resolve Cloudflare 521 After Server Update

2026-07-28 11:12:59
Docker Container Exits Immediately with Exit Code 137 - Cloudflare Wildcard DNS Setup for Multiple Sites-How to Resolve Cloudflare 521 After Server Update

Result check

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

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