avoid certificate error when using web filter override

Hi.

Im trying to get it working.

So. 

http://kb.fortinet.com/kb/documentLink.do?externalID=FD37342

Seems like v5.6.0 dont have "set ovrd-auth-cert"

Only options in "config webfilter fortiguard"

1. ovrd-auth-port-http

2. ovrd-auth-port-https

3. ovrd-auth-port-warning

4. ovrd-auth-https

any help would be appreciated. thanks.