Symptom
Affected ASA platforms will be unable to register with the Smart Call Home server if the IdenTrust certificate is not recognized.
Conditions
All affected ASA software versions after the certificates expire.
Workaround
Upgrade the ASA software to a recommended maintenance release.
Further Problem Description
Reference the Field Notice link below for the applicable ASA maintenance release upgrades.
https://www.cisco.com/c/en/us/support/docs/field-notices/721/fn72103.html