3.4.4 Message Processing Events and Sequencing Rules
The client MUST pass any error that is received from the invocation of an RPC method to the application that issued the RPC call. For all of the methods, if RPC_S_ACCESS_DENIED (0x00000005) is returned as an exception or E_ACCESS_DENIED (0x80070005)<351> is returned as a return value, the client needs to make sure it has administrative privileges on the RRAS server.
The Rasrpc server MUST perform a strict Network Data Representation (NDR) data consistency check at target level 5.0, as specified in [MS-RPCE] section 3.
This protocol MUST indicate to the RPC runtime that it is to reject a NULL unique or full pointer with nonzero conformant value, as specified in section 3 of [MS-RPCE].