An invalid login causes the server to validate the user with each IP address and thus causes multiple login failures. If you have set a maximum number of login attempts, one invalid logon could cause an LDAP account lockout. To prevent this issue from occurring, follow the steps described here: http://www-01.ibm.com/support/docview.wss?rs=180&uid=swg1PK42672
This configures LDAP authentication for only the Rational Asset Manager application.