Elasticsearch nodes not being discovered in EC2 in 5.6

I am setting up an Elasticsearch cluster in EC2 but it is failing with the crucial discovery stage. I am using packer to build the instances and this works. However when I start up a master I receive the message

"[2017-09-12T13:26:35,595][WARN ][o.e.d.z.ZenDiscovery ] [cF8JVs0] not enough master nodes discovered during pinging (found [[Candidate{node={cF8JVs0}{cF8JVs0iQx2BtY_ABnaaIg}{8Z1GmqjZQ0GJPwOSfSeCIQ}{}{}{aws_availability_zone=eu-west-1b}, clusterStateVersion=-1}]], but needed [3]), pinging again"

even when three masters are up.

Our IAM policy is

"Statement": [
"Action": [
"Effect": "Allow",
"Resource": [
"Version": "2012-10-17"

and our EC2 settings are

discovery.ec2.node_cache_time: 120s
cloud.node.auto_attributes: true
discovery.zen.join_timeout: 90s
discovery.zen.ping_timeout: 30s
discovery.zen.hosts_provider: ec2

groups: [sg-67b5e51f]
host_type: private_ip

plugin.mandatory: discovery-ec2

network.host: ec2:privateIpv4


The documentation appears to be a little out of date and I cannot understand what is going wrong.

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