DirectAccess Passive Mode
Specifies whether NCA service runs in Passive Mode or not.
Set this to Disabled to keep NCA probing actively all the time. If this setting is not configured, NCA probing is in active mode by default.
At least Windows Server 2008 R2 or Windows 7
Not Configured - No registry values are specified.
Disabled - Any values that would be created by the policy in the registry are deleted.
Enabled - Adding, modifying or delete values in the registry.
DirectAccess Passive Mode can be found in the Group Policy.
Please navigate to Computer Configuration - Policies - Administrative Templates - Network - DirectAccess Client Experience Settings folder.