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What solved it for me:

On the laptop, ROS_HOSTNAME wasn't set (nothing in .bashrc). After launching rviz on the laptop, I looked at the environmental variables again, and saw that something had set ROS_HOSTNAME=localhost, which seems to have the effect of causing it to reject remote connections.

Solution: on the laptop, set ROS_HOSTNAME=$ROS_IP (I added this to .bachrc, after ROS_IP=<ip addr of laptop>). Then remote connections are accepted.

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