IIS doesn't use user environment variables

Question

I\'m deploying a .NET Core application twice to the same server, once for QA, and once for Production. Currently I have each one of them using a different local user to run

Answer 1

If you want to use user specific environment variables, then the application pool setting LoadUserProfile should be set to true (false is the default),

What exactly happens when I set LoadUserProfile of IIS pool?