Very interesting. So to access it before login you have to select the instance name.

But I don't see how to set the port and namespace so that IRISSECURESTARTA uses them in logging in...

What about the port#, I have multiple installs of Cache and one of IRIS.  Does iris-callin use "1972"?

Actually its not a crash, it terminates with

Process finished with exit code -1073741515 (0xC0000135) on executing IRISSECURESTARTA.