Upon connecting you get only a blank window. All input seems to be ignored. I can verify via packet capture that the keystrokes are being sent from the client to the server with one key per packet. The server doesn't seem to send much of anything after the initial negotiation. If you wait a while (several minutes) it eventually sends the

   arrows to move
   keys to change letter
   space to stamp

instructions. But even then the rest of the window is blank and input is still ignored.