I've just started working with Cassandra (homebrew install), version 3.7 and cqlsh version 5.0.1. , OS X El Capitan
Cassandra starts up fine and the cluster is operational instantly.
Cqlsh is not working (on any of the nodes) and emits the following error:
Connection error: ('Unable to connect to any servers', {'127.0.0.1': error(61, "Tried connecting to [('127.0.0.1', 9042)]. Last error: Connection refused")})
nodetool status
. The IP address you see is the one you should specify with the cqlsh command (it's probably not 127.0.0.1). - Aaron