After an upgrade of the Automation Engine from an older version to version 11.1, 11.2, 12.0 or 12.1, the z/OS CallAPI fails. This may happen even though the CallAPI was updated as well.
The z/OS CallAPI doesn’t encrypt messages with the encryption algorithm which is expected by the CP. So they are rejected by the CP:
The z/OS CallAPI uses an older encryption algorithm. Therefore messages from it were rejected by the CP as “unencrypted”.
Update to a version listed below or a newer version if available.
Note: The name of the CallAPI utility has changed, it’s necessary to adapt it, for example in jobs, own programs, etc. More about in can be found in the Documentation:
Integration Guide > CallAPI > Platforms for CallAPIs > CallAPI for z/OS
Fix Status: Released
Fix Version(s): Automation Engine 12.1.1 HF3 - Available
Component(s): CallAPI MVS
In the UC_AS_SETTINGS within client 0 set: