Hello,
For SEP 12.1, unmanaged client licensing is required. Make sure the Unmanaged clients are licensed.
If we install unmanaged client Sonar, IRON and other new features do not work. To enable the submission of reputation data from an unmanaged client, you must install a paid license on the client.
Use the following procedure to install a license on an unmanaged client.
Licensing an unmanaged client
http://www.symantec.com/docs/HOWTO54944
VIDEO: https://www-secure.symantec.com/connect/videos/sep-121-licensing-unmanaged-client
Hope that helps!!