ORA 12170 : Connection timeout error : Help needed

Hi,
The scenario is as follows: I have Oracle 11g R2 installed on a Windows Server 2008 (32-bit) server. The database SID is 'PGMS'. I am accessing (or want to access remotely) the Oracle database from the Visual Studio 2008 development environment (client environment) running on a Windows XP (SP3) platform. I have already installed the ODAC (Ver. 11.2.0.2.1) package for the Visual Studio environment.
I have created a sample Windows Forms application that uses the Oracle data access components. The sample schema HR in the Oracle database has already been unlocked. This is the schema that I am using in the application.
The issue that I am facing is that when I am adding the data connection in the Visual Studio environment; 'Test Connection' functionality returns the following error: ORA-12170 ... Connection timed out.
I have checked the TNSNAMES.ORA file, and everything is as is mentioned in the Oracle documentation. It is as follows:
PGMS=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.161)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = PGMS)
Kindly request the community to help me out in overcoming the error and in making the connection successfully. We have a System administrator but not a database administrator. The Oracle installation has been done by me.
Thanks,
Renj
----------

Sunny, it's as follows:
(1) SQLNET.ORA file contents are as follows:
# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES = (NTS)
(2) LISTENER.ORA file content are as follows:
# listener.ora Network Configuration File: C:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\Administrator\product\11.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\Administrator\product\11.2.0\dbhome_1\bin\oraclr11.dll")
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.161)(PORT = 1521))
ADR_BASE_LISTENER = C:\app\Administrator
Edited by: Renjith2 on May 9, 2011 3:17 PM
Edited by: Renjith2 on May 9, 2011 3:22 PM

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APPRCIATE your hlp.
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LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 07-JUL-2006 12:27
:59
Copyright (c) 1991, 2005, Oracle. All rights reserved.
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# Generated by Oracle configuration tools.
# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
Thanks,
Kas

ORA 12170 : Connection timeout error : Help needed

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