In my case the FortiGuard DNS feature did not respect my switching DNS
from Fortinet to public DNS in the firewall. The only way I could
completely solve the issue was to set my internal DNS servers to forward
to public DNS and completely remove Fort...
This is, in my opinion, a poor response by Fortinet. It leans to a "not
our fault" attitude, with a side helping of "not a big deal, after all
it's 'mostly a temporary issue'", and a dash of "one possible reason"
and "somehow", which is unacceptable....
