Does DCS for Memcached Support Public Access?

No.

If public access is disabled for a DCS instance, you cannot access it in local environments and can only access it through an ECS that is in the same VPC as the instance. VPCs are used to ensure network security of public cloud services.

During application development and debugging, you can connect to a DCS instance from your local environment by using an ECS that can communicate with your instance for forwarding your requests. For details, see Using SSH Tunneling for Public Access to a DCS Instance.