How to make Wcf accessable with multiple domains

Question

Below is my WCF service which i have created. I was able to access this service with in the domain.However i want to make this service available across domain through BCS from sharepoint designer. Can you please help me what to make changes in Web.config file and the code so that it is accessible across domain.My Web.config is below.

public Vendor[] GetVendors(string strFilter)
        {
            string siteName = "http://myappserver.com/myname/";
            string webName = "Susite2";
            string listName = "Vendors List";
            string fieldTitle = "Title";
            List<Vendor> listVendor = new List<Vendor>();

            using (SPSite site = new SPSite(siteName))
            {
                using (SPWeb web = site.AllWebs[webName])
                //using (SPWeb web = site.OpenWeb())
                {
                   SPList list = web.Lists.TryGetList(listName);
                    if (list != null)
                    {
                        SPQuery query = new SPQuery();
                        query.ViewFields = "<FieldRef Name='Title' />" + "<FieldRef Name='ID'/>";
                        query.ViewFieldsOnly = true;
                        if (!string.IsNullOrEmpty(strFilter))
                            query.Query = "<Where><Eq><FieldRef Name='Title'/><Value Type='Text'>" + strFilter + "</Value></Eq></Where>";
                        SPListItemCollection items = list.GetItems(query);
                        if (items.Count > 0)
                        {
                            foreach (SPListItem item in items)
                            {
                                string title = Convert.ToString(item[fieldTitle]);
                                Vendor vendor = new Vendor();
                                vendor.Name = title;
                                vendor.VendorId = item.ID;
                                listVendor.Add(vendor);

                            }
                        }
                    }
                }
            }
                 return listVendor.OrderBy(a => a.Name).Select(a => a).ToArray();
    }

WEB.COnfig

<?xml version="1.0"?>
<configuration>

  <configSections>
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
      <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
          <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" />
          <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
          <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
          <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
        </sectionGroup>
      </sectionGroup>
    </sectionGroup>
  </configSections>
  <appSettings/>
  <connectionStrings/>
  <system.web>
    <compilation debug="true">
      <assemblies>
        <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
      </assemblies>
    </compilation>
    <!--
        The <authentication> section enables configuration 
        of the security authentication mode used by 
        ASP.NET to identify an incoming user. 
    -->
    <authentication mode="Windows" />
    <!--
        The <customErrors> section enables configuration 
        of what to do if/when an unhandled error occurs 
        during the execution of a request. Specifically, 
        it enables developers to configure html error pages 
        to be displayed in place of a error stack trace.

        <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
         <error statusCode="403" redirect="NoAccess.htm" />
         <error statusCode="404" redirect="FileNotFound.htm" />
        </customErrors>
    -->
    <pages>
      <controls>
        <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      </controls>
    </pages>

    <httpHandlers>
      <remove verb="*" path="*.asmx"/>
      <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
    </httpHandlers>
    <httpModules>
      <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    </httpModules>
  </system.web>
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4"
                type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
        <providerOption name="CompilerVersion" value="v3.5"/>
        <providerOption name="WarnAsError" value="false"/>
      </compiler>
    </compilers>
  </system.codedom>
  <!-- 
      The system.webServer section is required for running ASP.NET AJAX under Internet
      Information Services 7.0.  It is not necessary for previous version of IIS.
  -->
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules>
      <remove name="ScriptModule" />
      <add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    </modules>
    <handlers>
      <remove name="WebServiceHandlerFactory-Integrated"/>
      <remove name="ScriptHandlerFactory" />
      <remove name="ScriptHandlerFactoryAppServices" />
      <remove name="ScriptResource" />
      <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode"
           type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode"
           type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    </handlers>
  </system.webServer>
  <runtime>
    <assemblyBinding appliesTo="v2.0.05727" xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <system.serviceModel>
    <services>
      <service behaviorConfiguration="SPListData.CustomDataListBehavior"
        name="SPListData.CustomDataList">
        <endpoint address="http://18.15.158.125:186/CustomDataList.svc" binding="wsHttpBinding" contract="SPListData.ICustomDataList">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>

      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="SPListData.Service1Behavior">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
        <behavior name="SPListData.CustomDataListBehavior">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

</configuration>

ERROR SCREEN SHOT

Answer 1

When using passthrough as the authentication scheme, you need to configure Kerberos Delegated Authentication for most real world scenarios.

When BCS attempts to use NTLM Windows authentication there is no mechanism for BCS to pass the current user's credentials on to the WCF service. This is why you get the authentication error, because your WCF service is rejecting AUTHORITY\ANONYMOUS LOGON.

When you use Kerberos, BCS is delegated the ability to pass your Kerberos ticket on to the WCF service. For Kerberos to work, all servers must be configured with the correct SPNs.

Here is a link to another question where I provide an answer to this same sort of scenario with BCS. Configuring Kerberos is not a trivial task. Here is the most important conceptual detail, though.

Understanding Passthrough Authentication
Passthrough authentication is in the Impersonation and Delegation authentication model. Setting the value of the AuthenticationMode element to Passthrough causes BCS to use the credentials of the current user to access the external system. Passthrough is simple to set up by selecting Connect with User’s Identity when configuring the external system connection in SharePoint Designer, as was shown in the walk-through earlier in this chapter. However, Passthrough authentication is unlikely to be useful in many situations because of limitations inherent in Windows authentication.

-Business Connectivity Services security overview (SharePoint Server 2010)

As I stated, to get by the limitations of NTLM, you need to configure Kerberos.

Your other option would be to create a service account in Active Directory, add it to the Secure Store and configure BCS to impersonate that account. You would then use SharePoint's authorization mechanism to control who has access to the External List.

Regarding basicHttpBinding

By default, the basicHttpBinding security mode is None. This default setting means that you do not have authentication and that neither transport nor message security is enabled. By enabling Windows authentication with TransportCredentialOnly, you will get authentication, but no message protection; this is similar to how an ASMX Web service works.

http://msdn.microsoft.com/en-us/library/ff648505.aspx

Answer 2

The issue is resolved by making the below change in my web.config

wshttpbinindg to basicHttpbinidng( <endpoint address="18.15.158.125:186/CustomDataList.svc"; binding="basicHttpBinding" contract="SPListData.ICustomDataList">

Also one more change which i made was for my web service in IIS instead of Apppool account i have given windows user account.