It’s very likely that you can’t get an additional public IP for free, since you are on a hosted facility. But you may try to create a tunnel to 162.243.14.121 and from 162.243.14.121 to 10.0.2.15 port 4000.
ssh -R 4500:localhost:4000 user@162.243.14.121
It won’t work as fast as a direct connection but better than nothing. Be also sure you disable UDP in the connection setup.
Otherwise I strongly suggest you ask to the help-desk of the provider offering the hosting service.