Good, I restarted the memcached service into my web instance and worked again). The memcached service into my Bitnami instance allowes me to connect to ElastiCache.
When you get timeout issue, it is best to check the security group, NACLs of the Elasticache and EC2 for allowing the port ( in this case 11211 or the custom port, if configured ). Try with more than one EC2 instance to see if the issue is at EC2 or Elasticache side. Also, keep an eye on the Elasticache events to see if there is anything going on with the cluster.
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