I have an RF660 and the remote administration (ssh) has been turned off, how do I turn it back on?

You need to turn on ssh using the Webadmin, here is what you need to do after you login using Webadmin:

1) Click on Administration

2) Click on SSH (left hand side)

3) Put a check box in the status and Save

4) Make sure Allowed Networks show Any

5) Make sure Allowed Users show loginuser