Remote Access Control Panel: Requires Password

I have an Apple Remote Access (ARA) Personal Server on my network. In the Remote Access Setup control panel, when selecting the Answer calls checkbox, I get a dialog with the message "A password is required to set answering on this network", and a field for the password. I entered my personal password, but it was not accepted. What is wrong?
AppleTalk networks have the ability to lock out remote access including ARA. The network administrator enables or disables this feature with the Security Zone feature. You have to obtain a password from your Network administrator.

The Security Zone feature prevents the unauthorized remote access of an AppleTalk network.
Published Date: Feb 18, 2012