[HECnet] DECnet-VAX for VMS 2.0 Setup Question

How do I tell it to use default/no password? Thank you. NCP>DEFINE REMOTE REMOTE NODE NAME(1-6 CHARS):XX REMOTE NODE NUMBER(2-240):43 FILENAME FOR SECONDARY LOADER(1-13 CHARS,OPTIONAL): FILE USED FOR TERTIARY LOADER(1-13 CHARS,OPTIONAL): DOWN-LINE LOAD FILE(1-13 CHARS,OPTIONAL): BOOTSTRAP PASSWORD(EXACTLY 4 CHARS,OPTIONAL): *PASSWORD REMOTE SENDS DURING INIT SEQUENCE(1-8 CHARS):** **%NCP-E-BADPARS, unrecognized parameter "_NA"** **PASSWORD REMOTE SENDS DURING INIT SEQUENCE(1-8 CHARS):*