Reestablishing a Lost Trust Relationship

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When a trust relationship is established between two domains, the password used to create the relationship is immediately changed by the operating system, even if there was no initial password. The controllers and servers for both domains know the new password. The new password is not visible to the users, however. This password change happens regularly to provide extra security. Because of this, once the trust relationship is broken, the only way to reestablish the trust is to reset it completely on both ends, which serves to reset the password.

One side effect of the automatic password change is that the administrator of the trusting domain gets only one chance to create the trust relationship once the administrator of the trusted domain has set up the other end. If the password is typed incorrectly, it will no longer be valid, as the system will have automatically changed it. In this situation, the administrator of the trusted domain must remove the trusting domain from his or her list of "domains permitted to trust" and add it back in again, then the administrator on the other end should try again to establish the relationship.