Ulf Dittmer wrote:https://www.ssllabs.com/ has a helpful and informative server test. Checking intermediate certificates is one of the many things it does.
I tried out this website, but it told me "Assessment failed. No security protocols supported." ...I'm not quite sure what to make of that.
I just contacted InCommon, who provided me with the certificate. I'm hoping they'll be able to shed some light on what's going on.
Thanks for all the responses!