Linux ODBC 12504 error

I am doing Linux testing of software (that works on Windows) using ODBC against Oracle and getting a 12504 error (TNS:listener was not given the SID in CONNECT_DATA)
The ODBC call being used is SQLDriverConnect() and connect string that works on Windows is: "DSN=OracleDSN;UID=scott;PWD=tiger"
I have ORACLE_HOME set to /opt/oracle/product/11.1.0 and ORACLE_SID set to demo.
The Linux ODBC driver manager is unixODBC, and my .odbcinst.ini file specifies: Driver = /opt/oracle/product/11.1.0/lib/libsqora.so.11.1
In my .odbc.ini file, I have OracleDSN defined, and in that file I have tried setting: Servername = localhost/demo, to specify the SID, but that didn't help.
Question: How do I avoid the 12504 error and specify the SID name using SQLDriverConnect?

Are you able to connect using SQL*plus l
Yes, I can connect locally using: sqslplust scott/tiger
But for some reason, to connect remotely, I have to use the full service name, instead of just "demo":
sqlplus scott/[email protected]/demo.reddog.gpv.az05.bull.com
You may want to check your listener and tnsnames.ora settings for this error.I didn't see any obvious errors in these files (listed below):
# tnsnames.ora Network Configuration File: /opt/oracle/product/11.1.0/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
DEMO =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = reddog.gpv.az05.bull.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = demo.reddog.gpv.az05.bull.com)
# listener.ora Network Configuration File: /opt/oracle/product/11.1.0/network/admin/listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = reddog.gpv.az05.bull.com)(PORT = 1521))
)

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Message was edited by:
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Some posts that may be of use to you
Re: ODBC.INI - Essbase to Oracle database connection
Re: How to configure DSN in Linux for use in Essbase?
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Error
View Display Error
Odbc driver returned an error (SQLExecDirectW).
Error Details
Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P
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UDWORD                     2
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HDBC                0x10c19e80
UWORD                      108
UDWORD                     2
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HWND                0x00000000
WCHAR 0xb1e29098 [4294967293] "******"*
SWORD                       -3
WCHAR 0xb1e29098*
SWORD                        6
SWORD 0x433dcb3e*
UWORD                        0 <SQL_DRIVER_NOPROMPT>
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Edited by: 930841 on 2012-4-28 上午1:32
Edited by: 930841 on 2012-4-28 上午1:34

Hi,
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Thanks
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Many thanks in advance for your help and time.
Best Regards,
- ganesh

>>what is the exact connect string you are using?
For connection, I am using the plain hostname on which the DB server is running.
>>are you calling OCIServerAttach before OCISessionBegin?
I am not using OCISessionBegin. For connecting to DB server, I am using the following sequence of OCI calls (in this same order):
1) g_OCIEnvNlsCreate
2) g_OCIHandleAlloc //-- error handle: OCI_HTYPE_ERROR
3) g_OCIHandleAlloc // --- sevice context: OCI_HTYPE_SVCCTX
4) Setting driver name and application name for the session:
    OCISession* usersession = 0;
    ret = g_OCIAttrGet(m_pSvcCtx, OCI_HTYPE_SVCCTX, &usersession, NULL,
                             OCI_ATTR_SESSION, m_pErrHdl);
    if (ret == OCI_SUCCESS)
        ret = g_OCIAttrSet(usersession, OCI_HTYPE_SESSION, (void*)"OCI_DRV", 2,OCI_ATTR_DRIVER_NAME, m_pErrHdl);
        ret = g_OCIAttrSet(usersession, OCI_HTYPE_SESSION, (void*)"ClientApplication", <ub4>(strlen("DataReconScanning")), OCI_ATTR_CLIENT_IDENTIFIER, m_pErrHdl);
5) g_OCILogon() using the user, password and host name, as below:
g_OCILogon(m_pDbCon, m_pErrHdl, &m_pSvcCtx,
                               (text*)user.c_str(), static_cast<ub4>(user.length()),
                               (text*)pass.c_str(), static_cast<ub4>(pass.length()),
                               (text*)host.c_str(), static_cast<ub4>(host.length()));
Thanks.

Linux ODBC 12504 error

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