WCF using computer name instead of domain name when viewing MyService.svc?wsdl

WCF 4.0 has solved this issue in some instances with a new config option that use Request Headers:

    <behaviors>
        <serviceBehaviors>
            <behavior name="AutoVaultUploadBehavior">
                <useRequestHeadersForMetadataAddress>
                    <defaultPorts>
                        <add scheme="https" port="443" />
                    </defaultPorts>
                </useRequestHeadersForMetadataAddress>