Do the following:

1. Make sure that URL Filtering is enabled and activated.

   Enabling the remote lookup server query categorizes "Unknown" URLs as "Unrated". You can then take action for "Unrated" URLs in the URL Filtering Policy.

2. Make sure that "Unrated" is included under the URL Filtering sub-categories.
   1. Log on to the management console.
   2. Go to HTTP > URL Filtering > Settings.
   3. In the URL Categories tab, make sure that "Unrated" is listed in the Sub-category list/column.
3. Select the Unrated box under the sub-category.
4. In the Move the selected sub-categories to: drop-down box, select Others.
5. Click Move.
6. Make sure that the Unrated sub-category has an "x" under the Others column.
7. Go to HTTP > URL Filtering > Policies.
8. Edit or create a new policy.
9. Select the appropriate action for the Others category.
10. Click Save.