> But no i got the next problem. I tried to start an XDM-Chooser on the HP.
> Except an error message nothing happens...
> XDMCP fatal error: Session declined no valid address
> What can i do?

You know, I tried that a while ago on my hp380, and got the same error.
Works fine on my 1.3 i386 machine. I believe it is a bug/lack-o-feature
in the HP X11R5 server.
               
        nate