A few days ago I created a script to do some little, tiny checking on my servers. My plan was to create a Task Scheduler so that script can be executed periodically. But ( yeah, there is always a but ), I encountered an error. If we look carefully at the error, it did not mentioned about Securty or policy setting, but I know it must related to UAC. Issues : Receive error when configuring Task Scheduler : An Error has occurred for task <Task Name>. The following error was reported: A specific logon session does not exist. It may already have been terminated. Troubleshooting   Go to Start > Administrative Tools > Click at Task Scheduler  Browse to Task Scheduler (local) > Task Scheduler Library  Right click at the specific Task Scheduler > choose Properties  At General tab, the radio box " Run whether user is logged on or not " is enabled . Which means, the setting is okay.  Further checking, go to Start > Ru