Gracias Pablo por tu pronta respuesta. Te paso el Web.Config. Te remarco lo que cambie según los ejemplos que vi para conectarme al Active Directory.
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your
ASP.NET application, please visit
-->
<configuration>
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<section name="EAWeb.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-EAWeb-20150226125302.mdf;Initial Catalog=aspnet-EAWeb-20150226125302;Integrated Security=True" providerName="System.Data.SqlClient" />
<add name="ADConnectionString" connectionString="LDAP://ServidorAD.architecture.MiCliente.corp" />
</connectionStrings>
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
<add key="MvcSiteMapProvider_UseExternalDIContainer" value="false" />
<add key="MvcSiteMapProvider_ScanAssembliesForSiteMapNodes" value="true" />
<add key="MvcSiteMapProvider_IncludeAssembliesForScan" value="EAWeb" />
<add key="RepositoryEA" value="EAConnectString:EADB --- DBType=1;Connect=Provider=SQLOLEDB.1;Password=SuPassword;Persist Security Info=True;User ID=sa;Initial Catalog=EADB;Data Source=SQLSRV2012CL\DBEngine;LazyLoad=1;" />
<add key="FolderToExportHTMLReport" value="C:\AppServ\www\EADB" />
<add key="URLHTMLReport" value="http:\\111.22.333.4:puerto" />
<add key="EAExporter" value="C:\EAExporter\EAExporter.exe" />
</appSettings>
<system.web>
<siteMap defaultProvider="MvcSiteMapProvider" enabled="false">
<providers>
<clear />
<add name="MvcSiteMapProvider" type="MvcSiteMapProvider.DefaultProvider, MvcSiteMapProvider" siteMapFile="~/Mvc.Sitemap" />
</providers>
</siteMap>
<authentication mode="Forms">
<forms defaultUrl="/Home/Index" enableCrossAppRedirects="false" loginUrl="/Views/Accounts/Login" />
</authentication>
<membership defaultProvider="ADMembership">
<providers>
<add name="ADMembership" type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicToken=b03f5f7f11d50a3a" connectionStringName="ADConnectionString" connectionUsername="architecture/administrator" connectionPassword="SuPassword" />
</providers>
</membership>
<compilation targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
<pages>
<namespaces>
<add namespace="MvcSiteMapProvider.Web.Html" />
<add namespace="MvcSiteMapProvider.Web.Html.Models" />
</namespaces>
</pages>
<identity impersonate="false" password="SuPassword" userName="ARCHITECTURE\EAUser" />
</system.web>
<system.webServer>
<security>
<requestFiltering>
<fileExtensions allowUnlisted="true">
<remove fileExtension="." />
<add fileExtension="." allowed="true" />
</fileExtensions>
</requestFiltering>
</security>
<modules>
<remove name="FormsAuthentication" />
<remove name="UrlRoutingModule-4.0" />
<add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" />
</modules>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="EntityFramework" publicKeyToken="B77A5C561934E089" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.OAuth" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.Cookies" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v12.0" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
<applicationSettings>
<EAWeb.Properties.Settings>
<setting name="EAWeb_wcfea_object_Object" serializeAs="String">
</setting>
<setting name="EAWeb_wcfea_package_Package" serializeAs="String">
</setting>
</EAWeb.Properties.Settings>
</applicationSettings>
</configuration>