Configuring the Identity of an IIS Application Pool

If a web-site needs to run under a specific identity, IIS application pools provide a convenient means of achieving this. However, a reoccurring problem I come up against in setting these up is forgetting to ensure the identity is also a member of the local IIS_WPG group. TechNet has the full story.

So if you get one of these red icons on your Application Pool, check the IIS_WPG group.