Exchange 2013 ecp iis error

After installing Exchange 2013 I got this “Server Error in ‘/ecp’ Application” when entering “Exchange Admin Center” web page.

“Could not load type ‘Microsoft.Exchange.Managment.Security.AdfsFederationAuthModule'”

Solution: Exchange 2013 did not install the “Windows Identity Foundation 3.5” automatically. So all there is to it, add this feature.