I am installing ERP 2005 on MS Cluster platform. I have done through the all phases that mentioned in the installation guide successfully up to the phase that Central Instance Installation. When I started to run sapinst it went on very well till phase RFC Check then sapinst got error message saying that ' Make sure that the system is started, that the user DDIC exists and that the password of user DDIC is correct'. When I checked the system status and saw that the system is started and SAP LOGON windows is coming. But I can not login to the system because both of the user SAP* and DDIC is refused by the system. Despite I entered the SAP* and DDIC password at the beginning of the sapinst where I am asked to input system parameters before starting the installation. So I think I am lost with SAP* and DDIC password. I would appreciate if any of you could help on the subject.