Set “True” for “ useAppPoolCredentials“Ī discussion about the binding limit on IIS forum.

This error is mostly generated due to invalid credentials or because the browser didn’t understand how to supply the credentials. As a result, the message shown may differ. As a result, instead of the web page, the browser will display an error message. When your browser refuses access to the page you seek to view, you will receive a 401 error. Select “ system.webServer/security/ authentcation/windowsAuthentication” A 401 unauthorized error is an HTTP code that presents that the server received a request and that request is unauthorized. An Overview of the 401 Error Code When there is a problem with a request, HTTP 400 status codes are returned.Uncheck “ Enable Kernel-mode authentication“.Steps to use user-mode authentication instead of kernel-mode: When your browser refuses access to the page you seek. Use user-mode authentication for your application to get around binding limitation of kernel-mode. When there is a problem with a request, HTTP 400 status codes are returned. If you add 65 or more bindings, IIS displays “ 401.2 Unauthorized: Logon Failed Due to ServerĬonfiguration with No Authentication” error even though the credentials are correct.Ī change for Windows Server 2008 R2 or Windows Server 2012 R2 is not expected for this limitation. For the kernel-mode, there is a limitation: You can add maximum 64 bindings to your site. Windows authentication process can take place on the user-mode (IIS worker process) or kernel-mode (HTTP.SYS).

401 error code