To enable Https for WCF, you need to change the config in the service site. For host in IIS, you need to make sure do not assign the name to bindings/[binding type]/binding and do not assign binding name in services/service/endpoint. Below is the sample:
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="HttpsBehavior" >
<serviceMetadata httpsGetEnabled="true" httpGetEnabled="true" policyVersion="Policy12"/>
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service name="TestService" behaviorConfiguration="HttpsBehavior" >
<endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange" />
<endpoint
address=""
binding="basicHttpBinding" "No Bindding Name here"
contract="mProductive.PortalAdmin.WebSite.IWebPurchase"
/>
</service>
</services>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" >
<baseAddressPrefixFilters>
<add prefix="http://localhost/"/>
</baseAddressPrefixFilters>
</serviceHostingEnvironment>
<bindings >
<basicHttpBinding>
<binding "No Bindding Name here">
<security mode="Transport">
<transport clientCredentialType="None"/></security>
</binding>
</basicHttpBinding>
</bindings>
</system.serviceModel>
