Modify Program Using Sync Framework to use WCF - wcf

Question

I'm trying to synchronize a client database with a central database. I successfully did that using the Synchronization framework as long as both the client and central database are on the same network. However, I need for this to work with the client being outside the network and the firewall. The firewall prevents communications on port 1433, so I started to explore WCF as an option so port 80 is used.
I tried this and put the WCF service under IIS 7:
http://code.msdn.microsoft.com/Database-SyncSQL-Server-e97d1208
but have gotten this error:
Failed: The caller was not authenticated by the service.
I searched high and low for a solution to this error but have found none. Does anyone know a tutorial on how to use the sync framework over WCF?
Here is the web.config file on the IIS server:
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
<httpRuntime maxRequestLength="65536" />
<customErrors mode="Off" />
</system.web>
<system.serviceModel>
<services>
<service behaviorConfiguration="WebSyncContract.SqlWebSyncService" name="WebSyncContract.SqlWebSyncService">
<endpoint address="" binding="wsHttpBinding" bindingConfiguration="largeMessageHttpBinding" contract="WebSyncContract.ISqlSyncContract">
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="http://web-services.hexagroup.us/WebSyncContract.SqlWebSyncService.svc" />
</baseAddresses>
</host>
</service>
<service name="WebSyncContract.SqlSyncProviderProxy" behaviorConfiguration="WebSyncContract.SqlSyncProviderProxy" >
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />
</service>
<service behaviorConfiguration="WebSyncContract.SyncService" name="WebSyncContract.SyncService">
<endpoint address="" binding="wsHttpBinding" bindingConfiguration="largeMessageHttpBinding" contract="WebSyncContract.ISyncContract">
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<!--<add baseAddress="http://localhost:8080/"/>-->
<add baseAddress="http://web-services.hexagroup.us/WebSyncContract.SqlWebSyncService.svc" />
</baseAddresses>
</host>
</service>
</services>
<bindings>
<wsHttpBinding>
<!-- We are using Server cert only.-->
<binding name="largeMessageHttpBinding" maxReceivedMessageSize="2147483647" receiveTimeout="00:10:00" sendTimeout="00:10:00">
<readerQuotas maxArrayLength="2147483647" />
<!--<reliableSession enabled="true" />
<security mode="None" />-->
</binding>
</wsHttpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="WebSyncContract.SqlWebSyncService">
<!-- To avoid disclosing metadata information,
set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="True" />
<!-- To receive exception details in faults for debugging purposes,
set the value below to true. Set to false before deployment
to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="True" />
</behavior>
<behavior name="WebSyncContract.SqlSyncProviderProxy" >
<serviceMetadata httpGetEnabled="true" />
</behavior>
<behavior name="WebSyncContract.SyncService" >
<serviceMetadata httpGetEnabled="true" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
<!--
To browse web app root directory during debugging, set the value below to true.
Set to false before deployment to avoid disclosing web app folder information.
-->
<directoryBrowse enabled="true" />
</system.webServer>
</configuration>