the host at http://my.d-trust.net/ uses this root CA:
D-TRUST Root Class 3 CA 2 EV 2009
This root CA is in Firefox and Internet Explorer, but not in the McAfee maintained list of known CAs.
Web Gateway only knows about:
D-TRUST Root Class 3 CA 2 2009
(note the missing "EV").
How would I "officially" ask for inclusion of this CA in Web Gateway?
Posting it here is perfectly fine. The official alternative is filing an SR with support. They will escalate this to engineering and then I will add it ;-)