The dashboard widget indicates that FortiGuard Web Filtering is not reachable. However, AntiVirus, IPS, and
Application Control have no problems as shown in the exhibit.

You contacted Fortinet’s customer service and discovered that your FortiGuard Web Filtering contract is still valid for several months.
What are two reasons for this problem? (Choose two.) not. http://cookbook.fortinet.com/troubleshooting-web-filtering/

A.
You have another security device in front of FortiGate blocking ports 8888 and 53.

B.
FortiGuard Web Filtering is not enabled in any firewall policy.

C.
You did not enable Web Filtering cache under Web Filtering and E-mail Filtering Options.

D.
You have a firewall policy blocking ports 8888 and 53.

Explanation:

If Web filtering shows unreachable then we have to verify, whether web filtering enabled in security policies or
Web filtering enabled in a policy but the port 8888 and 53 are not selected, means the policy blocking the ports.
Reference: