Can't access docker image from EC2 server

I've got a standard EC2 Ubuntu server running a basic LAMP stack. I've installed Docker and I'm trying to hook up a solr container (http://ift.tt/1rOg03m specificly).

I have the docker image running ce32c020e7da makuk66/docker-solr "/bin/bash -c '/opt/ 10 minutes ago Up 10 minutes 0.0.0.0:8983->8983/tcp solr5 According to the readme of the solr image I should be able to access the solr admin panel on port 8983

Using the public IP of the EC2 server on port 80 I land on a web page (expected as apache is running) but when trying to access on port [..]:8983 I get 504 Gateway Timeout.

I've allowed all incoming connections on port 8983 for the security group that the EC2 server is a part of but still no luck...

There isn't anything further I should need to do here is there?