Hi,
go to ur web.config file
http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/26775170-1f24-4b27-b299-5674ec747a91/
<services>
<service behaviorConfiguration="Default" name="MyProject.Authorization">
<endpoint address="ws" binding="wsHttpBinding" contract="MyProject.IAuthorization" />
<endpoint address="" behaviorConfiguration="webBehavior" binding="webHttpBinding" contract="MyProject.IAuthorization" />
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
</service>