X server acting funny when displaying remote KDE session

[Vince Hoffman]

> > No.  Ssh uses port forwarding.  That works by accepting X
> > connections
> > locally at the client machine and than forwarding the data
> > packets
> > that arrive on that "display" to your actual server through
> > an
> > internal SSH tunnel.  Your DISPLAY variable on the client
> > should be
> > something like localhost:10.0.
> 
> Ah, that means that xhost + should not be needed because
> neither the X server nor the client notices that the
> connection isn't local. Well, I need xhost +, so the
> tunneling is most probably not working. But why does ssh not
> complain? I do provide the -X option!
> 
> Cheers
> Stefan

Is it enabled at the server ?
(in /path/to/sshd_config  is  the option "X11Forwarding" set to yes ?)