When a failure occurs on an active device, the system attempts to recover. In some circumstances, when the connection is broken, another user can unintentionally reestablish the session that had the failure.
For example, assume that USERA powered off a workstation without signing off. USERB could power on the workstation and restart USERA’s session without signing on. To prevent this possibility, set the Device I/O Error Action (QDEVRCYACN) system value to *DSCMSG. When a device fails, the system will end the user’s job.