Control over Inter User Communication Vehicle (IUCV) and Virtual Machine Communications Facility (VMCF) functions is available with CA Top Secret.
This feature allows you to control a virtual machine’s ability to CONNECT with any other users and CP system services and to mediate VMCF communications between virtual machines.
TSS PERMIT(USERA) IUCV(USERB)
In this example, USERA is authorized to perform an IUCV CONNECT function with USERB as the target of the connection.
If you wish to enable IUCV CONNECT security, you should add OPTIONS(4) to the server startup Parameter File. You should also ensure that their secondary user is not connected to *MSG, or connected to any user connected to *MSG.
Making IUCV CONNECT optional was done to avoid possible system hangs if the server is processing any IUCV CONNECT requests for its secondary user, or for any ACID connected to the secondary user via *MSG.
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