Configure Windows authentication
To use Windows authentication, you need to use a separate application – WindowsAuthWebHost.
Perform the following: 
    - From your Sitefinity CMS account, download the WindowsAuthWebHost application and build it. 
     
    - In the IIS, host the WindowsAuthWebHost application in the root directory.    
 
    - In Sitefinity CMS configure Windows authentication provider in the following way:
    
        - Navigate to Administration » Settings » Advanced.
         
        - In the left pane, expand Authentication » SecurityTokenService » AuthenticationProviders » WindowsAuthentication. 
         
        - In field Metadata Address, enter your WindowsAuthWebHost address.
        For example, enter https://localhost:893 
        - Configure the callback path.
        For example, enter /Sitefinity/signin-custom
        This setting is mandatory for Windows authentication when you use  the Default Sitefinity authentication protocol.
         
        - Select Enabled checkbox and save your changes.
         
    
     
    - Setup LDAP settings in the following way:
    
        - Navigate to Administration » Settings » Advanced. 
         
        - In the left pane, expand Security » LDAP Settings » LDAP Connections » DefaultLdapConnection. 
         
        - Setup the configuration properties for your system.
         
    
     
    - Create new LDAP Membership provider in the following way:
    
        - Expand Security » Membership Providers, and click Create new. 
         
        - In Name, enter the name of the provider, which must be the same as the LDAP login domain. 
        
 NOTE: The name is case sensitive. 
        EXAMPLE:For example, if your LDAP login domain is MYDOMAIN, a new provider must be created with name MYDOMAIN.
         
        - In ProviderTypeName, enter Telerik.Sitefinity.Security.Ldap.LdapMembershipProvider, Telerik.Sitefinity
         
        - Save your changes.
         
    
     
    - Restart the IIS. 
     
    - In Sitefinity CMS, navigate to Administration » Users. 
     
    - Click the newly created provider, find your domain user and assign it to the desired roles. 
     
    - Open the 
web.config of the WindowsAuthWebHost application and inside section <appSettings>, set the IdpReplyUrl property to the address of your Sitefinity CMS site in the following way:
    
        - When you use the Default authentication protocol, set the IdpReplyUrl to the absolute URL of the callback path as configured in Step 3.
        For example, https://<my-site>.com/Sitefinity/signin-custom. 
        - When you use the OpenID authentication protocol and the callback field is empty, set the IdpReplyUrl.
        For example, https://<my-site>.com/sitefinity/authenticate/openid/.
         
        - When you use the OpenID authentication protocol and the callback path is specified explicitly, set the IdpReplyUrl to https://<my-site>.com/<callback-path>.
         
    
     
    - In the IIS, select the WindowsAuthWebHost application, open Authentication, enable Windows Authentication and Anonymous Authentication, and disable all others. 
     
    - Restart your website. 
     
RESULT: Next time when the login screen is displayed, it will have a button that you can use to login with your Windows credentials.