http://bugs.winehq.org/show_bug.cgi?id=19781
--- Comment #28 from Kai Blin kai.blin@gmail.com 2009-11-07 04:59:42 --- Actually the problem is that the rpc server side in Wine does not handle authentication whatsoever. It never calls out to SSPI and never attaches a challenge packet to the BIND_ACK reply, so the rpc client code never finishes the handshake.
So technically this is an rpc bug. :)