IBM System SSL As of Software Release 7.0, TIBCO EMS Client for z/OS (MVS) uses the IBM System SSL facility to create secure connections to the server. It is expected that the client program will run within the security context of a user which has access to a SAF ring containing the necessary certificates and keys to make a connection. It is further expected that the account used will have all the necessary security permissions to use the IBM cryptographic services required to support IBM SSL connections.