A few things:
1. Make sure Media Network is turned on in MC. Without that, JRemote and friends won't work.
2. Double check the IP address on your computer running MC.
3. It's possible you have a firewall limiting access to ports on your MC computer.
It might be fastest to try "surfing" directly to the MCWS port from a tablet. In a web browser you would type something like this:
http://192.168.1.2:52199Replace the 192.168.1.2 with the IP address of your MC computer. If that works, the network path to the MC computer is clear and working. If not, you'll need to get that cleared up first.
Good luck.
Brian.