Ho un dominio su aruba hostato su windows, con un form di invio mail una volta che faccio invia mi da questo errore The page cannot be displayed:

The page you are looking for cannot be displayed because an invalid method (HTTP verb) was used to attempt access.

Please try the following:

* Contact the Web site administrator if you believe that this request should be allowed.
* Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly.

HTTP Error 405 - The HTTP verb used to access this page is not allowed.
Internet Information Services (IIS)

In un server linux non mi da questo problema.

Come mai?