So what message are you getting? When I connect to an SSL site, I do
not normally get a warning dialog unless their certificate has expired,
it is not issued specifically for that domain, or some other error.
Have you check the Advanced tab under options in the Security group for
what settings might apply to whatever error/warning message that you are
getting?
So, again, what is the message? That the certificate expired? That it
is for a different domain than the one for which it was registered?
That it is invalid? That you can download their certificate? You
haven't indicated if you are having a problem with their certificate or
if you just don't want to be prompted by whatever dialog it is that you
are seeing.