Mac OS X Server: Guest Access Unavailable Via the Chooser

I enabled guest access to my Mac OS X Server machine via Apple File Services, yet when I try to log in from the Chooser, the radio button for Guest is still grayed out.
Changes to guest access are available immediately to clients logging in via TCP/IP. For clients that connect via AppleTalk, a server restart is necessary for guest logins to become enabled.
Published Date: Feb 18, 2012