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Steps To Setup Kerberos For Windows Authentication

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Kerberos/NTLM Single Sign On (SSO)

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Steps To Setup Kerberos For Windows Authentication

  • Open Command prompt in Administrator mode.
  • Execute the following command on it to add Service Principal Name (SPN) for the account
    • setspn -a HTTP/## Server FQDN ## ## Domain Service Account ## Example: C:\Users\Administrator> setspn -A HTTP/mini.example.com gpadmin
      Note: "mini.exmaple.com" here is FQDN. Make sure it's resolvable on the Windows server running AD service.
  • Open Active Directory Users and Computers.
  • Search for the service account which was used to create the Service Principal Name (SPN).
  • Navigate to the Delegation tab.
  • Select Trust this user for delegation to any service (Kerberos only).
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  • Click Apply.
  • Open up IIS Manager.
  • Select the site which you want to apply Windows Authentication to.
  • Select the Application Pool for that website. Right click on it and select Advanced Settings.
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  • Use Custom Account and set the account as the service account for which delegation was enabled. You would need to enter the password of the service account as well.
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  • Navigate to the Authentication section for the website.
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  • Enable Windows Authentication and disable Anonymous Authentication.(Both cannot work simultaneously)
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  • Go to the Configuration Editor.
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    • Search for: system.webServer/security/authentication/windowsAuthentication
      kerberos windows-7
  • Set useKernelMode as False and useAppPoolCredentials as True in the Configuration editor.
  • Click Apply.
  • Restart IIS server.
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