How to fix "connect error = 101"

I’m trying to setup up a ROS action. If I start the action server on the ROV and the action client on my computer, connected through tether, the server will start printing out “::connect error = 101”.

I’m not sure what other information could be useful? I can’t find much online about what “::connect error = 101” means.

Using ROS kinetic, Ubuntu 16.04, ardusub 3.5.3.