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Forcefully terminating a user session in MVS

Login Prompt of Hercules TK4- MVS distribution
The TK4- login screen

My latest project involves running an emulated IBM mainframe on a virtual machine scheduled by Nomad. I came across a situation where my TSO session became unresponsive and I was unable to break out of the error by F13 or LOGOFF into my 3270 terminal.

If you have access to the operator’s console, you can CANCEL the session by issuing /C U=<USER_ID>. This will terminate the session and allow you to log in again through your terminal.

Happy main framing!

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