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copied!<p>Ok, so I've found two solutions to this problem. One thanks to Zhaph - Ben Duguid's answer which is an HttpModule that allows ASP.Net to fully manage the authentication.</p> <p>The second solution, and the one that I am going with, is thanks to this question/answer.</p> <p><a href="https://stackoverflow.com/questions/208063/http-authentication-basic-or-digest-in-asp-classic-via-iis/1726629#1726629">HTTP Authentication (Basic or Digest) in ASP Classic via IIS</a></p> <p>I've stripped this down and have a simple test harness that seems to be working well. In this example, instead of a database call, it merely checks that the username and password match and considers that authenticated.</p> <pre><code>using System; using System.Text; namespace AuthenticationTests { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string authorisationHeader = Request.ServerVariables["HTTP_AUTHORIZATION"]; if (authorisationHeader != null && authorisationHeader.StartsWith("Basic ", StringComparison.InvariantCultureIgnoreCase)) { string authorizationParameters = Encoding.Default.GetString(Convert.FromBase64String(authorisationHeader.Substring("Basic ".Length))); string userName = authorizationParameters.Split(':')[0]; string password = authorizationParameters.Split(':')[1]; if (userName == password) //Perform your actual "login" check here. { //Authorised! //Page loads as normal. } else { Unauthorised(); } } else { Unauthorised(); } } private void Unauthorised() { Response.AddHeader("WWW-Authenticate", "Basic"); Response.Status = "401 Unauthorized"; Response.End(); } } } </code></pre>

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