This could be due to an issue with the public DNS we create to be static where the public DNS for the AWS instance will change every time that the instance is paused or shut down. What I would recommend as a workaround is to use the private IP given to the instance when browsing to it AND in the transceiver address when you create a sensor profile. When you navigate back to the server you can run ifconfig and then use the private IP address listed there which should persist for the duration of the course.
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