LDAP authentication is generally used by Same Sign-On (SSO) systems. The enterprise user logs on initially using a form-based enterprise login screen. The user enters an ID and password, and the SSO software then takes the information and sends it to the security server using an encrypted connection. The security server then logs on to the LDAP server on behalf of the user by providing the LDAP server with the user's ID and password. If successful, the security server then proceeds with any authorization and/or lets the user proceed to the application or resource that he or she wants to access.
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