How do I get root via SSH?

[bobkoure]

I have SSH enabled (don't need a lecture about telnet being BAD) but I cannot get root permissions. I can login as me (member of the administrators group) that works fine, but if I try to su neither my password or that for user admin works. If I login as user 'admin', that works, but I still cannot su with that user's password.
I ran into a comment on the web suggesting I login as root, with user admin's password - but this does not work.
What's the secret?

 

[Rusty]

sudo -i