You can choose to turn Directory authentication on or off on each computer, by changing the TLS channel policy setting in their respective GeneralSettings.gconfig file.
What you should know
Directory authentication is enabled at Security Center installation when you choose the recommended security settings, or by selecting Always validate the Directory certificate when you choose the custom security settings.
After Security Center is installed, if you want to change this setting, you must edit the GeneralSettings.gconfig file on each computer.