In this video tutorial I will show how to enable machine key feature in IIS manager. If you need to generate machine key. You should turn on windows feature from IIS.
By default machine key feature is not installed in IIS(Internet Information Services). To enable you need to install Asp.net XXX from world wide web in IIS manager.
After installing it you will get machine key option in IIS. So that you can generate the Machine Key.
Machine Key Option is enable in IIS: