Not Working - Multiple Machines Tutorial

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Tutorial:

http://wiki.ros.org/ROS/Tutorials/Mul...

The following commands working on a local machine:

• rosrun rospy_tutorails talker
• rosrun rospy_tutorials listener

Talker output:

[INFO] [WallTime: 1457273968.541468] hello world 1457273968.54
[INFO] [WallTime: 1457273968.645381] hello world 1457273968.65
[INFO] [WallTime: 1457273968.746015] hello world 1457273968.75
[INFO] [WallTime: 1457273968.844568] hello world 1457273968.84
[INFO] [WallTime: 1457273968.945620] hello world 1457273968.95

Listener output:

[INFO] [WallTime: 1457273968.541901] /listener_8333_1457273959532I heard hello world 1457273968.54
[INFO] [WallTime: 1457273968.645969] /listener_8333_1457273959532I heard hello world 1457273968.65
[INFO] [WallTime: 1457273968.746562] /listener_8333_1457273959532I heard hello world 1457273968.75
[INFO] [WallTime: 1457273968.845211] /listener_8333_1457273959532I heard hello world 1457273968.84
[INFO] [WallTime: 1457273968.946216] /listener_8333_1457273959532I heard hello world 1457273968.95

The location machine is OS X 10.11.3 and IP is 10.0.0.6 My remote machine is Ubuntu 14.04.5 and IP Is 10.0.0.4

SSH to both machines works. I the set ROS_MASTER_URI=http://10.0.0.6" and while the talker works, the listener does not hear any messages. How can I get this to work?