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Your slave machine probably cannot resolve the hostname of the primary machine.

From the slave machine, you should be able to do rosnode list and then use rosnode ping <node> to ping one of the remote nodes. If rosnode ping fails, try running rosnode info <node> on the node in question to get its hostname, and try to ping that hostname directly.

If it doesn't resolve or can't ping, you need to set ROS_IP on the master before running nodes there.

For more information on why this happens and how it works, watch my roscon talk from last year: http://vimeo.com/67806888