Question on su behavior

"Timothy Robnett" <[email protected]> Sat, 17 Feb 2007 07:17:47 -0600
Newsgroups gmane.linux.trustix.general
Message-ID <[email protected]>
Folks,

As a non-root user when I try to su to another account on my system
which I know the password for I am receiving the error "su: incorrect
password" after entering the correct password. To confirm I really
know the password I can from the same system ftp to localhost and
succesffully authenticate. What is it I don't understand about su in
this situation?

-- 
Regards,
[email protected]