Security for transactions that are received from an MSC link
You have several options when specifying security for transactions that are received by an IMS system from an MSC link. By default, RACF® and exit routines check security for direct-routed transactions and checks security for non-direct-routed transactions received from an MSC link.
Or, if your installation does not require MSC transaction security, you can disable all security checking for transactions received from an MSC link.
If you specify the use of RACF or exit routines to check security for any transactions received on an MSC link, you also need to specify which user ID these security facilities will use.
You can make all of the security specifications that are discussed in this topic by using the positional parameters of the MSCSEC= startup parameter in the DFSDCxxx PROCLIB member. The specifications made in MSCSEC= define the default security that your IMS system performs when it receives transactions from an MSC link.
The security specifications that you make with the MSCSEC= startup parameter are local in scope and apply only to the IMS system in which you make them.
Related reading: For more information about the DFSDCxxx PROCLIB member, see IMS Version 15.4 System Definition.