[Xymon] Intermediate cert monitoring

What was the exact problem with the intermediate certificate? What should be monitored? Maybe we can come up with a way to add additional monitoring parameters to Xymon's SSL monitoring if we know exactly what should be monitored.

My first guess is expiration, but I'm not sure if you can sign a cert if it expires after your intermediate is due to expire. The only other thought is if the chain was incomplete...