I have a web site that I switched from NETWORK_SERVICE to AppPoolIdentity. I did this so I could see which process was running in task manager (I have a runaway process issue). After changing the app pool to AppPoolIdentity (from NETWORK_SERVICE), some functions in the application don't work. I think its related to local file access restrictions, but not certain.
When I look at the directory on web server in Windows Explorer, I can see where NETWORK_SERVICE has been given read/write access to the directories the app tried to access. How do I grant the same level of privileges for the AppPoolIdentity? I don't see a SID in the active director list.