2.2. 配置目录服务器防火墙
在 LDAP 主机上，确保防火墙允许访问目录服务器的安全(636)端口，以便 LDAP 客户端可以访问 Directory 服务器。使默认非安全端口(389)保持关闭。
# firewall-cmd --zone=public --add-port=636/tcp
# firewall-cmd --zone=public --add-port=636/tcp --permanent
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