Listener worked well but sql developers connection failed

Hi all,
this problem is frustrating me. I installed oracle 11g and try to connect the instance(SID: tbtest) from sql developer. But I always get error:
Status: Failure-Test failed:io exception. The network adapter could not establish the connection!
I checked the listener. Everything seems ok.
Below is my listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = in-canc-zhang45.cancer.iu.edu)(PORT = 1521))
This is my tnsnames.ora
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
TBTEST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = in-canc-zhang45.cancer.iu.edu)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = tbtest.cancer.iu.edu)
here is the output of tnsping tbtest
TNS Ping Utility for Linux: Version 11.1.0.6.0 - Production on 10-FEB-2010 16:01:00
Copyright (c) 1997, 2007, 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 = in-canc-zhang45.cancer.iu.edu)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = tbtest.cancer.iu.edu)))
OK (10 msec)
Below is the output of lsnrctl status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=in-canc-zhang45.cancer.iu.edu)(PORT=1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 11.1.0.6.0 - Production
Start Date 10-FEB-2010 13:36:36
Uptime 0 days 2 hr. 25 min. 8 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/in-canc-zhang45/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=in-canc-zhang45.cancer.iu.edu)(PORT=1521)))
Services Summary...
Service "tbtest.cancer.iu.edu" has 1 instance(s).
Instance "tbtest", status READY, has 1 handler(s) for this service...
Service "tbtestXDB.cancer.iu.edu" has 1 instance(s).
Instance "tbtest", status READY, has 1 handler(s) for this service...
Service "tbtest_XPT.cancer.iu.edu" has 1 instance(s).
Instance "tbtest", status READY, has 1 handler(s) for this service...
The command completed successfully
below is the output of hostname
[oracle@in-canc-zhang45 admin]$ hostname
in-canc-zhang45.cancer.iu.edu
Below is what i put in the sql developer connection
hostname: in-canc-zhang45.cancer.iu.edu
port: 1521
sid:tbtest
Dose anyone have some clues to solve this problem?
Thanks
Heng

I checked the trace/listener.log file. the last warning seems to be the failure from sqldeveloper request
11-FEB-2010 07:45:16 * ping * 0
Thu Feb 11 07:46:07 2010
11-FEB-2010 07:46:07 * ping * 0
Thu Feb 11 07:47:25 2010
11-FEB-2010 07:47:25 * ping * 0
Thu Feb 11 07:48:46 2010
11-FEB-2010 07:48:46 * service_update * tbtest * 0
Thu Feb 11 07:51:46 2010
11-FEB-2010 07:51:46 * service_update * tbtest * 0
Thu Feb 11 07:52:23 2010
*WARNING: Subscription for node down event still pending
11-FEB-2010 07:52:23 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=in-canc-zhang45.cancer.iu.edu)(USER=oracle))(COMMAND=status)(ARGUMENTS=64)(SERVICE=LISTENER)(VERSION=185599488)) * status * 0*

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