The default server principal name for
the security provider, which is the authentication-service constant RPC_C_AUTHN_GSS_NEGOTIATE.
For information concerning Windows authentication-service constants [MSDN-AUTHN].
A client of this protocol MUST use:
A security provider that supports SPNEGO Protocol Extensions
([MS-RPCE] section 3 and [MS-SPNG]).
A principal name constructed by appending the name of the print
server to the string "host/".