On z/OS release 1.7 and later, Application Transparent - Transport Layer Security (AT-TLS) uses a Communications Server policy file to determine which sessions will use the SSL protocol.
The policy file specifies the z/OS jobs that are authorized to use SSL. Any job that communicates with an SSL Listener must also be authorized in the policy file. You can add multiple job names to the AT-TLS policy file.
To configure AT-TLS for PowerExchange, verify that the AT-TLS infrastructure is set up, and add a rule to the policy file.
For more information about AT-TLS, see the IBM AT-TLS documentation.