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2017-02-09 13:10:04 -0500 asked a question Docker ROS "unable to communicate with master!"

Hi, I have ros indigo running through docker and when i try to run rostopic list on a new terminal with roscore open in another, I get "ERROR: Unable to communicate with master!" I don't really have experience with any of this but both of these terminals are on the same laptop so I'm unsure as to what the problem could be or what to do,