Can fat-client directly access Oracle DB through firewall?

My java application(thin driver) can not access Oracle9i DB behind a firewall, even if the firewall open the port 1521 of the DB server.
The application is C/S architecture.
How can I config the DBserver or firewall to resovle the problem?
Or, it can not work in C/S mode?

See Re: Remote connectivity behind a firewall

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Use DirectoryEntries.Add Method
https://msdn.microsoft.com/en-us/library/system.directoryservices.directoryentries.add.aspx
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It depends :>
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Blaise,

Your message arrived at the rigth address :)
I am experienced in J2ME programming and made several projects with it including my graduation thesis . (you can check http://2m.turkmenweb.com for my J2ME projects).
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From Some source I got the following code . But it's not working , I am not able to update the table as well not able to access the data from table.
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REPORT ZORACLE.
INCLUDE ole2incl.
DATA: con TYPE ole2_object,
rec TYPE ole2_object.
DATA SQL(1023).
DATA: BEGIN OF SPL OCCURS 0,
VAL(1023),
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DATA: BEGIN OF I1 OCCURS 0,
F1(10) ,
F2 TYPE I,
END OF I1.
IF con-header IS INITIAL OR con-handle = -1.
CREATE OBJECT con 'ADODB.Connection'.
IF NOT sy-subrc = 0.
EXIT.
ENDIF.
CREATE OBJECT REC 'ADODB.Recordset'.
IF NOT sy-subrc = 0.
EXIT.
ENDIF.
ENDIF.
MDB connetion infomations ....
break-point.
CONCATENATE 'Provider=' '''OraOLEDB.Oracle''' ';'
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CONCATENATE SQL 'Password=' '''prodx''' ';'
INTO SQL.
CONCATENATE SQL 'User ID=' '''prod''' ';'
INTO SQL.
CONCATENATE SQL 'Data Source=' '''sterlite''' ';'
INTO SQL.
CONCATENATE SQL 'Mode=' '''Share Deny None'''
INTO SQL.
MDB connection ...
CALL METHOD OF CON 'Open'
EXPORTING #1 = SQL.
Query (insert) statement ...
SQL = 'insert into ofusers values('.
CONCATENATE SQL '''Atul''' ',' '''121''' ')' INTO SQL.
Query run ...
CALL METHOD OF REC 'Open'
EXPORTING #1 = SQL
#2 = CON
#3 = '1'.
Query (select) statement ...
SQL = 'select * from ofusers'.
Query run ...
CALL METHOD OF REC 'Open'
EXPORTING #1 = SQL
#2 = CON
#3 = '1'.
Selecting MDB record into SAP internal table ...
DO.
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LOOP AT I1.
WRITE: AT /1(10) I1-F1,
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FREE OBJECT rec.
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Hi swati,
1. for this u will also require help of basis team.
2. these are the steps.
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so that it can connect to secondary database)
(this will be done by basis team,
in which, they will specify the
IP address of the secondary database server,
the DATABASE ID, and the port number)
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amit m.

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user13764998 wrote:
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Below a comprehensive explanation that may help others.
We basically did what you proposed:
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Can fat-client directly access Oracle DB through firewall?

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