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nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found.Use the iptables CT target to attach helpers instead. メッセージ

Solution In Progress - Updated -

Issue

  • 次のメッセージは、起動するたびにカーネルにより 1 回記録されます。
nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.

Environment

  • Red Hat Enterprise Linux 8
  • nftables ファイアウォール
  • firewalld ファイアウォール
  • FTP などの "conntrack helper" を必要とするサービス

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