1.- Activate ICF service for SSL. The path is the following /sap/bc/soap/ici_ssl
Make sure that in the "Logon Data" tab for this service under "Security Requirement"section, "SSL" is checked.
2.- Switch your communication for CMS -> CRM to HTTPs model. To do so, create a RFC destination of type H pointing to one of the application servers (doesn't matter which one) of the CRM system and activating SSL for that destination in the logon / security tab. Make sure that you choose your own SSL Client Certificate.
3.- In transaction CRMM_BCB_ADM, maintain in the SESSION_DESTINATION field for the Communication the previously created RFC destination :
4.- If you are upgrading from CRM7.0 to CRM7.01, make sure that SAP note 1571486 is in place.