There are in the same domain. Stand alone means that the server is not PDC or BDC, but it's just a server participating in the domain. Before I changed the IP address, both clients and servers were runing perfectly. And, then I changed the IP addresses in both clients and servers to the new net address, and then I couldn't connect to the oracle servers. I have changed everything to reflect to the new net address, but it still didn't succeed. I have check the listener.ora, and other scripts to see whether the new IP addresses written there correctly. BTW I use SID.

Now, I am experimenting in other domain to see what caused that. Do you have any clue?

Regards,
Gunawan S.