We can login to notes id with new and previous passwords

We are using lotus domino 6.5. If we change our password of notes id, we can login to that id with old and new passwords. Please help me to recover from this

Subject: We can login to notes id with new and previous passwords

Hi,Set the option Server document → Security tab → Security settings → Check passwords on Notes IDs = Enabled.

This will take effect when users restart there Notes client next time.

HTH

Byju Joy