ORA-12170

Dear Expert,
I am wondering if someone can help me with the following:
I am trying to connect to the oracle database using sqlplus, but got tns connection time out error: ORA-12170.
Below is my tnsname.ora file on the client:
CBSSDEV =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.59.103.206)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = cbssdev.maricom.com)
CBSSDEV_207.59.103.206 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.59.103.206)(PORT = 1521))
(CONNECT_DATA =
(SID = CBSSDEV)
(SERVER = DEDICATED)
CBSSDEV.world =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.59.103.206)(PORT = 1521))
(CONNECT_DATA =
(SID = CBSSdev)
(SERVER = DEDICATED)
I will greatly appreciate any advice.
Thanks!

Thanks! Oracle 10gR2.
1. I tried the tnsping and ping as well. Below are the results:
C:\Documents and Settings\syang\Desktop>tnsping CBSSDEV.world
TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 25-AUG-2
007 20:05:39
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
C:\oracle\product\10.2.0\client\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = 207.59.103.206)(PORT = 1521))) (CONNECT_DATA = (SID = CBSSdev) (SERVER =
DEDICATED)))
TNS-12535: TNS:operation timed out
C:\Documents and Settings\syang\Desktop>ping 207.59.103.206
Pinging 207.59.103.206 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 207.59.103.206:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
C:\Documents and Settings\syang\Desktop>207.59.103.206
2. Here is the sqlnet.ora file on the client side:
# sqlnet.ora Network Configuration File: C:\oracle\product\10.2.0\client\network\admin\sqlnet.ora
# 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)

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