Hi Rahul, Were you able to get the ISN connected? Which user is logged in, was it the user who installed the ISN? Is this a new ISN or was it an existing (working) ISN?
Which version of TrueSight are you using? I would recommend opening a ticket with Support for specialized assistance and a review of your environment to see what may have changed.
The issue had been resolved with the help of BMC support. Looks like some of the binary files got corrupted which caused that error. We had to completely uninstall ISN and then re-installed it, and eventually ISN service started working properly.
Coming to your questions, we are using 11.0 version and the same user had been used throughout this process.