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 contains statements that define the SSL connections for the z/OS jobs that use SSL. Any job that communicates with an SSL Listener must have a statement in the policy file to define the secure connection. 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.