You can view the security groups on the ECS Management Console at any time.
To view the security groups list, perform the following:
Log on to the ECS console.
In the left-side navigation pane, click Security Groups.
Select a region. A list of all the security groups in the specified region will be displayed.
(Optional) You can select VPC ID in the filter input box, and then search for a specific ID, to list all the security groups under this VPC.