Network Solutions EV SSL Not Trusted

No errors installing the certs at all. The problem is when people go to the site they get that pop up stating the cert isn't trusted and they should not proceed. this seems to be only affecting firefox users. Also, when i go to digicert.com/help it's reporting the cert is not trusted because a intermediate cert is missing. I've tried different combo's to try to figure out what would make up the intermediate cert, none of them seem to work when i apply it to the Profile - Chain field.