Connecting to Db from a client

Hi All,
am very new to Oracle.
I have a db server that is up and running.
I installed client on another pc.
After configuring the Client using the oracle net manger , I tried to test my connection, but it gave me the error message:
ORA-12541: TNS: No listner.
I was able to test the connection from the server pc to the db, but cannot from the client.
I am using 10g and on win xp.
Your help will be highly appreciated.
NB: I checked the listner status in the DB and every thing seemed alright.
thanks all

On your database server check if listener is running.
lsnrctl status
On your PC client side double check if you got hostname and port entered correctly. compare with listener status output

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SID_LIST_LISTENER =
(SID_LIST =
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(SID_NAME = PLSExtProc)
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(PROGRAM = extproc)
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Thanks & Regards,
Harshad

Harshad,
CONNECT system/[email protected]
This was not what I asked you to try, this cannot work ;).
I asked you to try :
connect system/[email protected]:1521/XE
I have also tried accessing the database homepage remotely using the url
http://abo-server.abosoftware.org:8080/apex
Per default only local access (from the same machine) is allowed via http.
You can change that either via the GUI (log in as SYSTEM):
Home>Administration>Manage HTTP Access
OR
connect as SYSTEM via sqlplus and run:
SQL>exec dbms_xdb.setListenerLocalAccess(false);###
It is documented at
http://download-west.oracle.com/docs/cd/B25329_01/doc/install.102/b25144/toc.htm#BABIJBHJ
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==============================================================
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========================================================
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LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 20-MAY-2011 11:49:29
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Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
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Alias LISTENER
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Copyright (c) 1997, 2009, Oracle. All rights reserved.
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================================================================
I am totally lost... What is going on here?
Any help is highly appreciated!
James

but I can ping the server and ssh to the server from my laptop...certain ports can be opened through FireWall while all others remain closed.
Listener accepts initial connection request on Port #1521 & then completes request on random high port
use of Wire Shark or similar packet sniffer can answer the mystery

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Vincent,
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