MSIR.0637 Warning: certificate expires in (numdays) days

This is a warning message that indicates that the certifying authority certificate being loaded via JANUS ADDCA expires in the indicated number of days. If the certifying authority associated with the certificate is still valid, make sure you obtain a new certificate for that authority before the expiration of the current certificate. Presumably, you'll have to do this well before this message is issued as a certifying authority should start signing certificates with a newer key well before the current certificate expires.