One of the changes between the old versions of IBM Infosphere Information Server (IIS) and the 11.3 and 11.5 version, which may not be obvious is the improvement in Secure Socket Layer (SSL). Beginning with 11.3 all communications between the client and services tier is done over HTTPS (SSL). This includes all clients that access the services tier, whether a rich desktop client, a browser-based client, or a command-line client.
About SSL communication in InfoSphere Information Server
InfoSphere Information Server, InfoSphere Information Server 11.5.0, Administering, Managing security, Security setup, Managing certificates, About SSL communication in InfoSphere Information Server