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Setup IIS for Windows Authentication LDAP

How does IIS request information from LDAP?

When an user login an SSO (Single Sign on) application, IIS sends a request to LDAP (Lightweight Directory Access Protocol) for user information for authentication. LDAP and IIS communicate ( IIS sends a request to LDAP in order to get some user information). Windows IIS Manager couldn't locate any connection between IIS and LDAP.

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Steps to Integrate IIS for Windows Authentication LDAP for Single Sign-On (SSO)

Configure IIS for Windows Authentication LDAP into Joomla

  • 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/ gpadmin
      Note: "" 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).
    •  Joomla LDAP kerberos windows-1
  • 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.
    •  Joomla LDAP kerberos windows-2
  • 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.
    •  Joomla LDAP kerberos windows-3
  • Navigate to the Authentication section for the website.
    •  Joomla LDAP kerberos windows-4
  • Enable Windows Authentication and disable Anonymous Authentication.(Both cannot work simultaneously)
    •  Joomla LDAP kerberos windows-5
  • Go to the Configuration Editor.
    •  Joomla LDAP kerberos windows-6
    • Search for: system.webServer/security/authentication/windowsAuthentication
       Joomla LDAP kerberos windows-7
  • Set useKernelMode as False and useAppPoolCredentials as True in the Configuration editor.
  • Click Apply.
  • Restart IIS server.

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