I am running:
nova network-create vmnet --fixed-range-v4=192.168.22.0/24 --bridge-interface=br100 --multi-host=T

and in the log files I am getting:
2014-01-02 00:07:10.978 21916 INFO nova.openstack.common.rpc.common [req-2d3ec6f8-159e-41fb-83d4-ccea44e4a98e abecb6da3a8643daa9e580c4ec61a6a2 a0edd2a531bb41e6b17e0fd644bfd494] Reconnecting to AMQP server on localhost:5672
2014-01-02 00:07:13.989 21916 ERROR nova.openstack.common.rpc.common [req-2d3ec6f8-159e-41fb-83d4-ccea44e4a98e abecb6da3a8643daa9e580c4ec61a6a2 a0edd2a531bb41e6b17e0fd644bfd494] AMQP server on localhost:5672 is unreachable: Socket closed. Trying again in 30 seconds.

Something comes to the rabbitmq since I see this in its' log:
=ERROR REPORT==== 2-Jan-2014::00:09:08 ===
closing AMQP connection <0.3326.0> (127.0.0.1:48220 -> 127.0.0.1:5672):
{handshake_error,starting,0,
                 {amqp_error,access_refused,
                             "AMQPLAIN login refused: user 'guest' - invalid credentials",
                             'connection.start_ok'}}

=INFO REPORT==== 2-Jan-2014::00:09:23 ===
accepting AMQP connection <0.3355.0> (127.0.0.1:48221 -> 127.0.0.1:5672)

Part of /etc/nova/nova.conf:
rabbit_host = controller
rabbit_password = pass
rabbit_port = 5672