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firewalldのワーニングが、LOGに出力されていたので、それの対処
# vi /var/log/messages
-----------------------------------------------
Jan 7 17:21:33 ns firewalld[93081]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future release. Please consider disabling it now.
-----------------------------------------------# vi /var/log/firewalld
-----------------------------------------------
2021-01-07 17:21:33 WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future release. Please consider disabling it now.
-----------------------------------------------Googleで検索したら無効にした方が良い設定のようなので設定を変更
# cp /etc/firewalld/firewalld.conf /etc/firewalld/firewalld.conf.org
# diff /etc/firewalld/firewalld.conf /etc/firewalld/firewalld.conf.org
75c75
< AllowZoneDrifting=no
---
> AllowZoneDrifting=yes
systemctl restart firewalld.service参考URL
【CentOS8】firewalldのエラー「Invalid option: ‘AllowZoneDrifting=yes’」の対処手順
CentOS8で構築する自宅サーバ：Firewallで不正アクセスをブロック