HTTP 405 Verb not allowed

Hi

I need some help. I am trying to configure my server for OWA, when i enter UN & PW on the logon screen I receive the following message.

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.
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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)

Any ideas anyone?

Thanks