He construido una aplicación en asp.net 3.5 que está alojada enAppHarbor. El problema es que en la reescritura de URL HTTPS no funciona. El siguiente es el código para ejecutar algunas de las páginas en SSL:

string CurrentUrl = Request.Url.ToString();
string sPath = System.Web.HttpContext.Current.Request.Url.AbsolutePath;      
System.IO.FileInfo oInfo = new System.IO.FileInfo(sPath);
string sRet = oInfo.Name;       
string sDir = oInfo.Directory.Name;     
pageName = sRet;
if (sRet == "Register.aspx" || sRet == "Login.aspx" || sRet == "Post.aspx" || sRet == "ChangePassword.aspx" || sRet == "ChangeUserStatus.aspx" || sRet == "Verification.aspx" || sRet == "ContactInfo.aspx" || sRet == "Find.aspx" || sRet == "MyAccount.aspx" || sRet == "MyEmailAddresses.aspx" || sRet == "Load.aspx" || sRet == "MyPostedLoads.aspx" || sRet == "MySubmittedBids.aspx" || sRet == "MySavedAddresses.aspx" || sRet == "MyCarriers.aspx" || sRet == "MyPotentialLoads.aspx" || sRet == "MyFreightAlarms.aspx" || sRet == "MyFreightAlarmsPreferences.aspx" || sRet == "MyAddress.aspx" || sRet == "GetUserComments.aspx" || sRet == "MyCreditCard.aspx" || sRet == "MyWallet.aspx" || sRet == "InvoiceMe.aspx" || sRet == "MyShippers.aspx" || sRet == "MyCoWorkers.aspx" || sRet == "MyACH.aspx" || sRet == "RouteMap.aspx" || sRet == "Pricing.aspx" || sRet == "PricingPayment.aspx" || sRet == "PaymentProcessed.aspx")
{
    string NewUrl = "";

    if (!Request.IsSecureConnection && !string.Equals(HttpContext.Current.Request.Headers["X-Forwarded-Proto"], "https", StringComparison.OrdinalIgnoreCase))
    {
        NewUrl = Regex.Replace(CurrentUrl,
                               @"^https?(://[^/:]*)(:\d*)?", 
                               "https$1", 
                               RegexOptions.IgnoreCase);

        Response.Redirect(NewUrl);
    }
}

Y la regla para la reescritura de URL en web.config:

<rewrite>
  <rules>
    <rule name="Rewrite with .aspx" stopProcessing="true">
      <match url="^([^\.]+)$" />
      <action type="Rewrite" url="{R:1}.aspx" />
    </rule>
    <rule name="Redirect .aspx page requests" stopProcessing="true">
      <match url="(.+)\.aspx" />
      <action type="Redirect" url="{R:1}" />
    </rule>
  </rules>
</rewrite>

El problema es que la página permanece en un bucle indefinido y no puede redirigir correctamente.