Wac server Get-OfficeWebAppsFarm : The content type text/html; charset=utf-8 of the response message

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The Wac server responding with a bad answer 500.21 if you try Get-officeWebAppsFarm

Get-OfficeWebAppsFarm : The content type text/html; charset=utf-8 of the response message does not match the content
type of the binding (application/soap+msbin1). If using a custom encoder, be sure that the IsContentTypeSupported
method is implemented properly. The first 1024 bytes of the response were: '


IIS 7.5 Detailed Error - 500.21 - Internal Server Error