Could not connect to Redis node on aws

You can't connect to eleasticache from outside of aws. It just the way it is setup. Would be nice to do for debugging and development, but for production it doesn't really make sense to introduce that much latency into a system that main purpose is to give as-fast-as-possible results.

From AWS FAQ:

Please note that IP-range based access control is currently not enabled for Cache Clusters. All clients to a Cache Cluster must be within the EC2 network, and authorized via security groups as described above.

http://aws.amazon.com/elasticache/faqs/

External access to Elasticache resources is possible yet discouraged:

Elasticache is a service designed to be used internally to your VPC. External access is discouraged due to the latency of Internet traffic and security concerns. However, if external access to Elasticache is required for test or development purposes, it can be done through a VPN.

Guide: Accessing ElastiCache Resources from Outside AWS