Tablet Server Access for Accumulo Running on AWS

I am attempting to run a simple driver to write some data to an Accumulo 1.5 instance running on AWS that is using a single node cluster managed by CDH 4.7 . The client successfully connects to zookeeper but then fails with the following message:

2015-06-26 12:12:13 WARN  ServerClient:163 - Failed to find an available server in the list of servers: [172.31.13.210:10011:9997 (120000)]

I tried applying the solution listed here , but this has not resolved the issue. The IP that is set for the master/slave is the internal AWS IP for the server.

Other than the warning message, I have not been able to find anything else in the Accumulo logs that indicate what is preventing connection to the master server. Any suggestions on where to look next?