Set the PPM affinity to LocalServer. Currently, it is not possible to use SSL through a DPA on the AS400 or Mainframe platforms
SSL support for AS400 has been added in 2.5.918 when using a DPAv4.
If you are currently licensed for a virtual DPA you can download the Virtual DPAv4 from here
If you currently have hardware DPA 3.x appliances and you want to swap these for hardware DPA 4.x appliances, contact your account manager to discuss this.