If your Event log contains:

<b>        Event ID: 113
        Source: W3SVC
        Type: Warning
        Category: NoneDescription: Instance 1 has invalid binding descriptor X

        Event ID: 115
        Source: W3SVC
        Type: Error
        Category: None
        Description: The service could not bind instance 1. The data is the error code.</b>
you have invalid information in the IIS metabase at SecureBindings.

To fix this, type:

%SystemRoot%\System32\Inetsrv\Adminsamples\adsutil set w3svc/1/SecureBindings :443:

NOTE: You can replace 443 with another port number.