ABB S4 RPC communication

Hi!

I am trying to set up a communication between a windows based PC and a
ABB S4 based robot controller using ethernet and rpc.
I ported the standard sun rpc library to windows and it is working with
my own server. When I try to call a simple RAP function (warm controller
restart) I get authentication error and the reason is that
authentication is too weak. Instead of none authentication I tried to
use unixauth (with uid = 0 gid = 0) but I got the same error.

What kind of authentication is used there? (authdes?, authunix with spec
params? )
Do I have to set up the userID on the controller?

Thanks in advance.

Regards
     Andor