For each ECS service with Security Group, perform the following :

1. Login to the AWS Management Console at https :// console.aws.amazon.com / vpc / home
2. In the left pane, click Security Groups
3. For each security group, perform the following :
4. Select the security group
5. Click the Inbound Rules tab
6. Identify the rules to be removed
7. Click the x in the Remove column
8. Click Save

Additional Reference : https :// docs.aws.amazon.com / AmazonECS / latest / developerguide / get – set – up – for – amazon – ecs.html #create-a-base-security-group