Hi,
Have you tried using ceistart instead of manually starting the connection? It basically is a wrapper around the commands you're trying to use.
Launch it with "ceistart" from the Ansys_installation\vXXX\CEI\bin directory. Then select the Remote Server option.

You'll need to enter hostname for the remote machine and your username. As long as the remote machine is configured correctly, then this should start EnSight with client locally, and server remote.
Hope this helps.
Best Regards,
Marina Galvagni