Cannot connect to DB from a client computer

Hi,
I installed 11gR2 last week and can access it from the DB server. However I cannot connect to the DB from my laptop :-(
==============================================================
C:\Users\jchen>tnsping jchen_dev
TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 20-MAY-2011 11:55:49
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\app\jchen\product\11.2.0\client_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = jchen-desktop.us.responsys.com)(PORT = 1521))) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = jchendev.us.responsys.com)))
TNS-12535: TNS:operation timed out
C:\Users\jchen>
C:\Users\jchen>ping jchen-desktop.us.responsys.com
Pinging jchen-desktop.us.responsys.com [172.19.192.132] with 32 bytes of data:
Reply from 172.19.192.132: bytes=32 time=3ms TTL=64
Reply from 172.19.192.132: bytes=32 time=1ms TTL=64
Reply from 172.19.192.132: bytes=32 time=1ms TTL=64
Reply from 172.19.192.132: bytes=32 time=1ms TTL=64
Ping statistics for 172.19.192.132:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 3ms, Average = 1ms
C:\Users\jchen>
===========================================================
If I do the same thing on DB server, I got:
========================================================
[oracle@jchen-desktop ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 20-MAY-2011 11:49:29
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 16-MAY-2011 10:52:05
Uptime 4 days 0 hr. 57 min. 23 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/jchen-desktop/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=jchen-desktop.us.responsys.com)(PORT=1521)))
Services Summary...
Service "jchendev.us.responsys.com" has 1 instance(s).
Instance "jchendev", status READY, has 1 handler(s) for this service...
Service "jchendevXDB.us.responsys.com" has 1 instance(s).
Instance "jchendev", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@jchen-desktop ~]$
[oracle@jchen-desktop ~]$ tnsping jchendev
TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 20-MAY-2011 11:51:15
Copyright (c) 1997, 2009, Oracle. All rights reserved.
Used parameter files:
/u01/app/oracle/product/11.2.0/db_1/network/admin/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = jchen-desktop.us.responsys.com)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = jchendev.us.responsys.com)))
OK (40 msec)
[oracle@jchen-desktop ~]$
================================================================
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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Harshad,
CONNECT system/[email protected]
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