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My understanding with this is that you have to allow both machines to be able to resolve one another via their hostnames, even if you set the ROS_MASTER_URI as the ip address.

To resolve this, I have added the machine's entries into their respective /etc/hosts files. e.g. Put an entry for B in A's hosts file, and put A in B's hosts file.

I've pulled up the following URL from a quick google search that may explain hosts files in more detail: http://www.faqs.org/docs/securing/chap9sec95.html