Gateway between ORacle and as400

Hello All,
I am tring to set agateway between Oracle 9i and as400/db2.
the drda gateway was intalled on the 9i on different oracle_hiome then the database( both on same machine) .
configured the listener.
and tnsping works!
when I try to access the as400/db2 from the oracle using dblink
i get "ORA-12154: TNS:could not resolve service name"
could anyone shade some light on this ? - does this mena my init<sid>.ora
is not configured correctly?
obviously I was not able to install the package since can not access the as400.
does any of you guys know how I can check for the db2 - database name?
since on the site I am working they can not help me with that, and I am not a db2 / as400 guy. ( I think that the parameter i have for that is wrong) .
thanks
S.

Hi Sahar,
Unfortunately, i do not have an account on metalink.
One question:
1. Using Oracle Migration Workbench is not a solution - because OMWB doesn't support version 5 of DB2400;
2. Using the Generic Connectivity (ODBC) to connect to DB2400 (on an AS400 machine) i have some problems in the configuration of the initSID.ora, listener.ora and tnsnames.ora and i am not able to connect to the database.
MY question is: will i be able to use the Oracle Transparent Gateway to connect to DB2400 V5R4 ?
Thanks a lot,
Michael

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