Authentication Mode Windows Error Iis 7.5
Web Platform Installer Get Help: Ask a Question in our Forums More Help Resources Blogs Forums HomeConfiguration Referencesystem.webServersecurityauthenticationwindowsAuthentication Windows Authentication OverviewCompatibilitySetupHow ToConfigurationSample CodeOverviewThe element defines configuration settings for the Internet Information Services (IIS) 7 Windows authentication module. You can use Windows authentication when your IIS 7 server runs on a corporate network that isusing Microsoft Active Directory service domain identities or other Windows accounts to identify users. Because of this, you can use Windows authentication whether or not your server is a member of an Active Directory domain. Windows authentication (formerly named NTLM, and also referred to as Windows NT Challenge/Response authentication) is a secure form of authentication because the user name and password are hashed before being sent across the network. When you enable Windows authentication, the client browser sends a strongly hashed version of the password in a cryptographic exchange with your Web server. Windows authentication supports two authentication protocols, Kerberos and NTLM, which are defined in the element. When you install and enable Windows authentication on IIS 7, the default protocol is Kerberos. The element can also contain a useKernelMode attribute that configures whether to use the kernel mode authentication feature that is new to Windows Server 2008. Windows authentication is best suited for an intranet environment for the following reasons: Client computers and Web servers are in the same domain. Administrators can make sure that every client browser is Internet Explorer 2.0 or later. HTTP proxy connections, which are not supported by NTLM, are not required. Kerberos version 5 requires a connection to Active Directory, which is not feasible in an Internet environment. New in IIS 7.5 The https://www.iis.net/configreference/system.webserver/security/authentication/windowsauthentication nasty issue getting Windows Authentication to work on a local instance of IIS 7.5 (Windows 7 Pro) to an ASP.net 4.0 site. I followed the basic steps. IIS Authentication Disable Anonymous Authentication Enable Windows Authentication Edit web.config This did a nice job of enabling Windows Authentication but every attempt to login was rejected and ultimately returned a 401.1 error. This is where the problem started. There appear to be many reasons http://stackoverflow.com/questions/17466665/windows-authentication-not-working-on-local-iis-7-5-error-401-1 for this that are well documented around the web including here on Stack Overflow. I'd tried: Editing IIS Authentication 'Advanced settings' for Windows Authentication to disable Extended Protection and Kernel-mode authentication Editing IIS Authentication 'Providers' to move NTLM above Negotiate. Editing IIS .NET Authorization Rules to explicity Allow users (and various other combinations). Various IIS command line scripts and tweaks. Various config tweaks in web.config file. Even some file system permissions tweaks. But all to no avail, the dreaded 401.1 remained. This really is a case of "can't see the wood for the trees". None of the solutions I managed to find (call it a case of bad search parameters if you will) worked for me so I thought it worth posting this question to, hopefully, provide a clear answer that's easier to find for anyone suffering the same issue. c# asp.net windows iis windows-authentication share|improve this question asked Jul 4 '13 at 9:26 PeteWiFi 96011017 add a comment| 3 Answers 3 active oldest votes up vote 47 down vote accepted The issue here is that modern versions of Windows (Windows XP SP2, Windows Server 2003 SP1 and up) include a loopback check security feature that is designed to help prevent reflection attacks on your computer. Therefore, authentication fails if the FQDN or the custom host header that yo
2, 20100 0 0 0 Symptoms You have an IIS 7.5 server hosted on Windows Server 2008 R2/Windows 7 and https://blogs.msdn.microsoft.com/webtopics/2010/04/02/unexpected-401-1-error-over-windows-integrated-authentication-on-iis-7-5-website/ when you try to browse to the site over Windows Integrated authentication it fails with 401.1 like below: Module WindowsAuthenticationModule Notification AuthenticateRequest Handler StaticFile Error Code 0x80090305 [Adding the above details in text to allow it to be searched on the net] Root cause The issue happens in a special case wherein we have: a. authentication mode Kernel-mode authentication already enabled at the Server level and, b. We go ahead and disable Kernel-mode authentication at the Web site level. This happens irrespective of NTLM or Kerberos being used as the authentication protocol for the web request. You will see the above error code 0x80090305 in the error page. This happens because we authentication mode windows just changed the authentication from kernel mode to user mode for the website. User mode does not have the authentication package initialized for the website and http.sys will send pre-auth request thinking site still needs kernel mode authentication. Restarting IIS will ensure authentication package is initialized correctly in the user mode for the website and http.sys should not send pre-auth requests anymore. In another words http.sys would not do authentication for the website anymore. Resolution To resolve this issue we need to restart W3SVC service as below from the command prompt: > net stop w3svc > net start w3svc Or simply run IISRESET. *Remember recycling application pool won’t resolve the issue. It’s the WWW service that has to be restarted. *Credit for the findings goes to Puneet Gupta
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