WCF metadata error

I have a wcf service running, which I am trying to get the metadata for proxy generation using svcutil

When i execute the command from svcutil I get the following error
WS-Metadata Exchange Error
    URI: http://devweb4/Service2/Setup.svc

    Metadata contains a reference that cannot be resolved: 'http://devweb4/Service2/Setup.svc?wsdl'

    The HTTP request is unauthorized with client authentication sc
s'. The authentication header received from the server was 'Negoti

    The remote server returned an error: (401) Unauthorized.

I can browse to the svc which is hosted in IIS and I do see the svcutil command link on the page it shows while browsing.

The config file has the following within the services tag
 
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
 
and the following in the behaviours
<serviceBehaviors>
				<behavior name="SetupBehavior">
					<serviceDebug includeExceptionDetailInFaults="true" />
					<serviceMetadata httpGetEnabled="true" />
				</behavior>
			</serviceBehaviors>

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