3.3.5.2.2 Verifying the Connection State

If the request being received is not an SMB2 NEGOTIATE Request or a traditional SMB_COM_NEGOTIATE, as described in section 1.7, and Connection.NegotiateDialect is 0xFFFF or 0x02FF, the server MUST disconnect the connection, as specified in section 3.3.7.1, and send no reply.