When using the WSS User Name Token Profile (With password text), make sure that the communication between the producer portal and consumer portal is secure, because the password is sent in plain text between the consumer and the producer.
Do not have two different consumers that point to the same producer URL using different identity propagation mechanism types.
Do not switch to another identity propagation mechanism after a consumer has been created and is using an identity propagation mechanism, because the user's portlets preferences are stored based on the identification of the user, and switching to another identity propagation results in a loss of user customization.