To stop a specific user server address space, the port that user server listens to must be known. The port can be determined by using the command:
F <scheduler>,TSO,DISPLAY,USER=ALL
The command response in CMDTASK will have one line with message SLR0036I for every user that is currently using scheduler services. The last column shows the port nnnnn the address space listens on. Then the user server address space can be terminated:
F MFA,ZSRV:STOP,PORT=<nnnnn>