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Target customers: Auto Scaling users who are accustomed to using security groups for whitelisting. Features released: after you create an ApsaraDB for POLARDB cluster, you must configure whitelisting settings for the cluster and create an initial account before you can connect to the cluster. In addition to the IP whitelist, you can also add security groups for whitelisting. An ECS security group is a virtual firewall that controls the inbound and outbound traffic of ECS instances in the security group. After an ECS security group is added, the ECS instances in the security group can connect to the ApsaraDB for POLARDB cluster.