During installation of the SMP 3.0 server, it will automatically generate a self-signed certificate that will be used for mutual authentication between SMP and Gateway system. This certificate will be based on the fully qualified domain name at the time of the installation and tend to expire in few years.
The attached document outlines the steps needed to renew the certificate using the Java keytool utility.
Please note this document is provided as reference only. All the parameters / system details will be different for your implementation, please contact your system admin for details.