Eu construí um aplicativo no asp.net 3.5 que está hospedado emAppHarbor. O problema é que na regravação de URL HTTPS não está funcionando. A seguir está o código para executar algumas das páginas no 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);
    }
}

E a regra para reescrita de URL no 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>

O problema é que a página permanece em um loop indefinido e não pode redirecionar corretamente.