Create fabric environment.
From another node try to join the fabric environment as per command.
fabric:join 10.74.252.99:2181 hostmachine
Within a minute root container is 'no' connected state. Check output of container-list.
[id] [version] [type] [connected] [profiles] [provision status]
root* 1.0 karaf no fabric success
fabric-ensemble-0000-1
jboss-fuse-full
However this can be easily resolved after restarting root container.