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It looks like your ROS_MASTER_URI is using a domain name, which might be linked to the public IP. You might want to try ROS_MASTER_URI=http://4.4.4.4:11311 The VM and your robot should use the same IP and ports. Otherwise you are not trying to connect to the same rosmaster.

You want to run your master in the cloud so all IPs should be 4.4.4.4 you should have then on your VM ROS_HOSTNAME=4.4.4.4

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