If the ECS instances in a security group do not need to access an ApsaraDB for MongoDB instance, we recommend that you remove the security group to ensure security. This topic describes how to remove a security group.
Procedure
Go to the Replica Set Instances or Sharded Cluster Instances page. In the top navigation bar, select the region in which the instance resides. Then, find the instance and click the ID of the instance.
In the left-side navigation pane of the instance details page, choose .
Perform the following operations based on your requirements.
Remove one or more security groups that are no longer needed
In the upper-left corner of the security group list, click Add Security Group.
In the Add Security Group panel, clear the security groups that are no longer needed.
Click OK.
Remove all security groups that are no longer needed
In the upper-left corner of the security group list, click Clear.
In the Clear Security Group message, read the information and click OK.