<rule name="Canonical host name" stopProcessing="true">
        <match url="(.*)" />
        <conditions>
          <add input="{HTTP_HOST}" pattern="^www\.mydomain\.ru$" negate="true" />
        </conditions>
        <action type="Redirect" redirectType="Permanent" url="http://www.mydomain.ru/{R:1}" />
      </rule>

        <rule name="RemoveTrailingSlash" stopProcessing="true">
          <match url="(.*)/$" />
          <conditions>
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
          </conditions>
          <action type="Redirect" redirectType="Permanent" url="{R:1}" />
        </rule>

        <rule name="LowerCaseURL" stopProcessing="true">
          <match url=".*[A-Z].*" ignoreCase="false" />
          <conditions>
            <add input="{REQUEST_URI}" pattern="^/umbraco/" negate="true" />
            <add input="{URL}" pattern="^.*\.(axd|asmx|css|js|jpg|jpeg|png|gif|mp3)$" negate="true" ignoreCase="true" />
            <add input="{URL}" pattern="cdv=1" negate="true" />
          </conditions>
          <action type="Redirect" redirectType="Permanent" url="{ToLower:{URL}}" />
        </rule>

FormsAuthentication.SetAuthCookie(UserName, RememberMe);
                ...
                System.Web.HttpCookie MyCookie = System.Web.Security.FormsAuthentication.GetAuthCookie(model.UserName, model.RememberMe);
                Response.Cookies[MyCookie.Name].Domain = ".MyDomain.ru"; //the second level domain name

     public class SiteUrlRouteHandler : MvcRouteHandler
     {
       protected override IHttpHandler GetHttpHandler(RequestContext requestContext)
       {
          //... здесь вообще чего угодно делаем с маршрутами, адресами, контроллерами и т.п.

          return base.GetHttpHandler(requestContext);
       }
     }

            context.MapRoute(
                name: "Default_default",
                url: "{controller}/{action}/{id}",
                defaults: new { area = "Default", controller = "Home", action = "Index", id = UrlParameter.Optional },
            ).Rou

context.MapRoute(
                name: "Default_default",
                url: "{controller}/{action}/{id}",
                defaults: new { area = "Default", controller = "Home", action = "Index", id = UrlParameter.Optional },
            ).RouteHandler = new SiteUrlRouteHandler();