When configured correctly, a GMS-managed appliance will report Web Filter information (blocked Websites) to GMS/Analyzer. To verify the required configuration, follow these steps:
On the appliance at Log | Categories, set the " Logging Level to Informational": 
On the appliance at Security Services | Content Filter | Configure, enable the ‘Log Access to URL’ setting:

Use the filter to view the Website Access Denied messages:

NOTE: CFS enforcement is Mandatory for these reports . For CFS 4.0 please visit : CFS 4.0 Overview, For Cfs 3.0 , please visit: CFS 3.0 Overview .