Re: Question on su behavior

> 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?

This users has to be a member of the root group.