Error accessing a url in unit test case

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WebForms

Below is the method code used for unit test case:

[TestMethod]
[HostType("ASP.NET")]
[UrlToTest("https://login.live.com/login.srf?wa=wsignin1.0&rpsnv=11&ct=1311328495&rver=6.1.6206.0&wp=MCMBI&wreply=https:%2F%2Fmcp.microsoft.com%2FAuthenticate%2FMigrate%2FMigrate.aspx%3FReturnUrl%3Dhttps:%2F%2Fmcp.microsoft.com%2Fmcp%2Fdefault.mspx&lc=1033&cb=wizid%3Ddf57638e-b739-4667-8316-25dc173aef4b%26returnurl%3Dhttps%253a%252f%252fmcp.microsoft.com%252fAuthenticate%252fMigrate%252fMigrate.aspx%253fReturnUrl%253dhttps%253a%252f%252fmcp.microsoft.com%252fmcp%252fdefault.mspx%26wp%3DMCMBI%26lcid%3D1033&id=74335")]

        public void LoginCheck()
        {
            Page page = testContextInstance.RequestedPage;
            PrivateObject po = new PrivateObject(page);
            TextBox txt1 = (TextBox)page.FindControl("login");

            po.Invoke("Page_Load", page, EventArgs.Empty);

            Assert.AreEqual(txt1.Text, "", true);

        }

Error:

The URL specified ('https://login.live.com/login.srf?wa=wsignin1.0&rpsnv=11&ct=1.....(same as the url mentioned above)') does not correspond to a valid directory. Tests configured to run in ASP.NET in IIS require a valid directory to exist for the URL. The URL may be invalid or may not point to a valid Web application.

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Issue: The unit test case created in VS2008 accessing a url of project not hosted in local IIS, error's out the above message also FYI..though the same url is accessible through the browser. But when the same peice of code is executed with the url of the project i.e., "http://localhost/abc123", then the unit test case gets executed successfully.

How can we access a url of project not hosted in local IIS?