Oracle Client on win2000 & Oracle Server on redhat 7.2

I've installed Oracle Client 9.2 on a win2000 machine. I want to connect to a Database on a Oracle Server, which is installed on a redhat 7.2 machine.
I can successly do everything about oracle on the redhat 7.2 server itself,but i can't connect the redhat 7.2 oracle server by oms,while i can connect the redhat 7.2 oracle server by standalone,the error hint as fallowing:
java.lang.NullPointerException error
why?
Please help....thanx....
null

Oracle software is multi home aware - which means you can install 10 different Oracle products and versions, each in its own unique Oracle Home directory, and switch between and run all 10 different products - even at the same time (assuming sufficient resources on the platform).
You cannot "+consolidate+" different Oracle Homes - it is an unwise thing to do. The Oracle Universal Installer (OUI) has the means to determine when installing a new product, whether or not you have the option to install into an existing Oracle Home.
And with OUI you also have the means to uninstall products in which case you can remove the corresponding Oracle Home from your platform.
Note though that despite multiple homes, certain configuration files will be shared (e.g. +/etc/oratab+ on Unix systems). In such a case you may need to manually update such a configuration file after removing an Oracle Home from your system.
Oracle XE sports its own installer (setup.exe on Windows) - so it does not use OUI. But it is multi-home aware - and can co-exists with other Oracle products in their specific Oracle Homes.

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Sorry for miscommunication..
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Starting tnslsnr: please wait...TNSLSNR for 32-bit Windows: Version 9.2.0.1.0 - Production
System parameter file is E:\oracle\ora92\network\admin\listener.ora
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Alias LISTENER
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tion
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Uptime 0 days 0 hr. 0 min. 0 sec
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Listener Log File E:\oracle\ora92\network\log\listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ECT-STPPC2316.BLR.INDIA.CGINET)(PORT
=1521)))
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The command completed successfully
=============
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Justin Cave ([email protected]):
Why do you need to run both clients on the same machine? Given that the Oracle7 environment was de-supported at the end of 2000 if memory serves, I doubt that the Oracle7 client has been tested on Win2000.
Justin<HR></BLOCKQUOTE>
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M Kiran Kumar Reddy wrote:
True, Tnsping is working but i am not able to connect to server
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user626162 wrote:
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