<%@ Page Language="C#" AutoEventWireup="True" CodeBehind="loginGoogleApps.aspx.cs" Inherits="OpenIdRelyingPartyWebForms.loginGoogleApps" ValidateRequest="false" MasterPageFile="~/Site.Master" %> <%@ Register Assembly="DotNetOpenAuth.OpenId.RelyingParty.UI" Namespace="DotNetOpenAuth.OpenId.RelyingParty" TagPrefix="rp" %> STOP: Full trust permissions are required for Google Apps support due to certificate chain verification requirements. Modify web.config to allow full trust before trying this sample.