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Fix Cloudflare 521 Error: DNS Configuration Problem - How to Resolve Docker Network Not Found on Windows-Stop Antivirus from Causing Chrome Connection Reset Errors

Updated 2026-07-28 09:24:50browser-issues
Fix Cloudflare 521 Error: DNS Configuration Problem - How to Resolve Docker Network Not Found on Windows-Stop Antivirus from Causing Chrome Connection Reset Errors
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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