why can't I su to root?

[Chan Wilson]

Odd, odd odd:

>zaphod:/pub/Macstuff/lib/aux_asm[40] su
>su: Sorry
>zaphod:/pub/Macstuff/lib/aux_asm[41] su root
>su: Sorry
>zaphod:/pub/Macstuff/lib/aux_asm[42] su Guest
>zaphod: su
>su: Sorry
>zaphod: logout
>zaphod:/pub/Macstuff/lib/aux_asm[43] rlogin loop -l Guest
>
>******************************************************************************
>*        			                                              *
>*                      W E L C O M E   T O   A / U X                         *
>******************************************************************************
>
>zaphod.Guest 1 % su
>Password:
>zaphod.Guest ! # exit

I can su to root from the Guest account.  I can't su to root
from my account.   

I'm fairly certain that it has to do with the fact that the password file
on Zaphod (a/ux) uses YP (NIS), as does the group file.  Trouble is, 
the man page for su has no mention of where su actually looks to determine
who can su, and the sunos man page for su isn't great help either.  And,
I can't trace su to see what it's doing....

WHERE'S MY DOCUMENTATION??????????

Thanks for any help...

--Chan

Chan Wilson
SRI Intl. Network Information Systems Center
333 Ravenswood Ave., EK289			Internet: cwilson at nisc.sri.com
Menlo Park, CA., 94025				Phone: (415)859-5921