IIS getting "value does not fall within the expected range" exception

Question

I am unable to change the authentication mode to custom on any App pool even the default ones.I am getting "value does not fall within the expected range" exception

Answer 1

I've had this exactly error message on IIS when trying to start a website and the problem was that the binding was wrong, there was a "space" after the url.

Check your bindings for any wrong characters and if there's anything else wrong with it.