Change prevent start on ES 2.2.1


3 ubuntu servers
installed ES with repository
all 3 nodes running ES 2.2.1

I'm running cluster with 3 nodes.
One of the nodes has been running as a single node for a long time. Now I added 2 new nodes and they connected to the first node.
If I change the first nodes elasticsearch.yml, it can't start again. I don't even get any elasticsearch.log in /var/log
Any changes to the elasticsearch.yml breaks to node. Even change to won't make the node to start

Why is it not startig again after just the change.. or how can I see why it can't start ?

Most of the time it's caused by a bad yml file.

Wrong indentation, space missing...

Perfect thanks.. I've missed a space in my network settings.
It starts now.. Thanks