I don't know rabbit-mq, but there seem to be authentication errors in its logs:
=ERROR REPORT==== 10-Apr-2013::11:23:16 ===
closing AMQP connection <0.1506.2> (127.0.0.1:44799 -> 127.0.0.1:5672):
{channel0_error,starting,
{amqp_error,access_refused,
"PLAIN login refused: user 'zenoss' - invalid credentials",
'connection.start_ok'}}
any idea where the authentication credentials ara stored?