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Stuck at Configuration Details when installing Enterprise Manager 12c linux

user12169148
user12169148 Member Posts: 6
edited Aug 7, 2012 4:25PM in Enterprise Manager
Hi all
I need a help with installations of Enterprise manager 12c. Usually it is a straight forward installtion. But this time, i encounter this error :
ERROR:SQLException null Resultset
Unable to connect to the database and validate whether it is a supported database due to one of the following reasons:

(1) Incorrect credentials
(2) Listener may be down
(3) Database may be down

Check the credentials ,the status of the listener and the database and retry.

I am sure I put in the correct username/password, port number and host name, I could connect by TOAD and sqlplus from my desktop with no problem. but the installer tells me that incorrect credentials were given. I really could not understand where the problem could be.
Any help or directions are greatly appreciated.
Yong

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