Issue Connecting to ROS Network on another computer. "Cannot connect to ROS master"

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I have been following tutorials online and those provided by Mathworks such as the one linked here:
I am running MATLAB on a Windows 10 computer while running a ROS master on Ubuntu on a separate one.
I used hostname -I to find the ip address of the computer running the ROS master, and attempted to use rosinit('IPaddress') in MATLAB and other methods such as those mentioned in the tutorial and it fails to connect.
The error is "Cannot connect to ROS master at http://IPaddress:11311. Check the specified address or hostname." Where IPaddress is the address gotten using hostname -I in a linux terminal.
I have no firewall on Ubuntu, and I turned off the firewall on my windows pc to no avail as well.
Both are on the same network/internet (my home internet).
Running roscore, my ROS_MASTER_URI is http://localhost:11311. I am using Ubuntu 16.04 and ROS Kinetic.
Any idea how to fix this issue?

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