[FreeNX-kNX] FreeNX: force SSL connections

[Wolf Wolfgang]

Hello,

I have got FreeNX installed and want to allow several users to use the
x session login over the FreeNX Server. Because of security reasons I 
want to force the users to encrypt the whole session with SSL. On the 
client you can enable this option, but you can also connect without SSL.
On the server I couldn't find any option, on how I would disallow
non-SSL 
connections.
Has someone a solution for this?
Thanks!

Wolfgang