On 7.2e there is an issue when using IIS Autologin. IIS Returns an HTTP error 405.0 - Method Not Allowed
The page you are looking for cannot be displayed because an invalid method (HTTP verb) is being used.
The logs show that the verb being used is "GET"
This issue was caused by a security update in 7.2e
This issue is fixed in 7.2e Hotfix 2
Turn off IIS Autologin