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Integrated Windows Authentication (IWA) is a popular authentication mechanism that is used to authenticate users in Microsoft Windows servers. It uses Negotiate/Kerberos or NTLM to authenticate users based on an encrypted ticket/message passed between a browser and a server. Follow the instructions in the sections below to configure IWA for local or federated authentication in WSO2 Identity Server (IS). 

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1. Add a DNS host entry in the Active Directory (AD) to map the IP address of the WSO2 Identity Server to a hostname. If there are multiple kerberos domains, WSO2 IS should have a virtual host name for each kerberos domain.

   Info
   When adding the DNS entry, generally the first part of the hostname is given. The AD will append the rest with it's AD domain. For example, if the AD domain is wso2.com, after you add a DNS host entry, the final result will be similiar to the following: Code Block title Example idp.wso2.com NOTE: Kerberos does not work with IP addresses, it relies on domain names and correct DNS entries only.

2. Open the carbon.xml file found in the <IS_HOME>/repository/conf folder and set the hostname (idp.wso2.com) in the <HostName> tag. 

   Code Block
   language xml
   <HostName>idp.wso2.com</HostName> <MgtHostName>idp.wso2.com</MgtHostName>\

3. Open the jaas.conf file found in the <IS_HOME>/repository/conf/identity folder and check if the configuration is as follows. (Refer this for more information on JAAS)

   Code Block
   Server { com.sun.security.auth.module.Krb5LoginModule required useKeyTab=false storeKey=true useTicketCache=false isInitiator=false; }; Client { com.sun.security.auth.module.Krb5LoginModule required useTicketCache=false; };

4. Register WSO2 IS using the same hostname (idp.wso2.com) in Active Directory. To do this, use the DNS tool on the machine that is running WSO2 IS to add an entry for the hostname (idp.is.local), and map it to the local ip address.

5. Create a service account in the Active Directory for WSO2 IS or use an existing account. (For this tutorial, the sample username of the service account is is_linux).

   Note
   Note: The account used for WSO2 IS needs to be different from the one used by the user to login to the application.

6. Run the following commands to register WSO2 IS as a service principal in Active Directory. 

   Note
   Note: Replace is_linux with the username of your service account in the command below. The format of the command is as follows: [setspn -A HTTP/<url of Identity Server> <service_account>]

   Code Block
   setspn -A HTTP/idp.wso2.com is_linux setspn -A HTTP/idp is_linux

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