Fortigate IP whois lookup

From the FortiOS manual:

WHOIS Lookup anchor for public IPv4 addresses

Reverse IP lookup is now possible in FortiOS 5.4. A WHOIS lookup icon is available when you mouse over a public IP address in a FortiView log. If you left-click on the lookup icon, a new tab is opened in your browser for www.networksolutions.com, and a lookup is performed on the selected IP address (this option persists after drilling down one level in FortiView).

For quite some time now, I have noticed that the IP whois lookup within the Fortigate always fails.  Is there any way to change the service or URL that the IP whois lookup uses?  There are several free whois lookup sites that I could plug in if I could change that.