An interesting development:
Now the message
Authentication rejected reason: None of the authentication protocols specified are supported and host based authentication failed.
still appears, but nautilus also opens, and I have been able to copy the relevant files into /etc.
Suse 9.3 puts the nautilus files into /opt/gnome/bin/
(And now I can play the pc levels of oxydmag on my linux machine (with enigma)
I have learnt quite a lot in the process and this forum is really good.)