SecurityException while trying to start remote Weblogic debugger

For some time I had been successfully using the IntelliJ "WebLogic Instance" debugger to connect to my weblogic server on a remote host, but now I get an error whenever I try to connect:

java.lang.SecurityException: Invalid Subject: principals=[system, Administrators]

"system" is my weblogic user-id. Can anyone tell me what this exception means, and what I may need to do to fix it? I have no idea where to look. Using the weblogic console, I can see that "system" and "Administrators" are valid user and group respectively. Interestingly, I am still able to debug that server by connecting with a generic "Remote" debug configuration ... only the "WebLogic Instance" debug causes the exception.

Any ideas or similar experiences are welcomed! Thanks,

Bill

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