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Amazon ElastiCache for Redis
ElastiCache for Redis User Guide (API Version 2015-02-02)

Step 2: Authorize Access

This section assumes that you are familiar with launching and connecting to Amazon EC2 instances. For more information, see the Amazon EC2 Getting Started Guide.

All ElastiCache clusters are designed to be accessed from an Amazon EC2 instance. The most common scenario is to access an ElastiCache cluster from an Amazon EC2 instance in the same Amazon Virtual Private Cloud (Amazon VPC). This is the scenario covered in this topic. For information on accessing your ElastiCache cluster from a different Amazon VPC, a different AWS Region, or even your corporate network, see:

By default, network access to your cluster is limited to the user account that was used to launch it. Before you can connect to a cluster from an EC2 instance, you must authorize the EC2 instance to access the cluster. The steps required depend upon whether you launched your cluster into EC2-VPC or EC2-Classic.

For the steps to authorize access to your cluster, see Accessing Your Cluster or Replication Group.