With the use of the Identity Manager Transporter it is not possible to transport system users together with their passwords (and password salt).
Identity Manager does not support the transport of passwords of system users between several environments with different levels of access.
Therefor the attributes DialogUser.Password and DialogUser.Salt are marked as IsToIgnoreOnExport=1 and IsToIgnoreOnImport=1.
In Identity Manager 6.1.2 and previous versions the password itself is not marked to be ignored for transport but the salt is. This also results in an unusable system user password.
Change the password of system users in the target environment manually.
Defect 20536 has been created to evaluate this issue in a future release of Identity Manager.