Local Install of Oracle DB 10g Release 2 (10.2) problem

Question

Good day,
I have a small problem. I am attempting to install a local instance of the Oracle database 10g r2 (10.2.0.1.0) on a laptop running Windows XP Pro /sp3. When I installed the database I was not connected to my company network. The installation was successful and I was able to connect to the local DB just fine. Now I am connected to the company network and am getting the error: '*ORA-12514: TNS:listener does not currently know of service requested in connect descriptor*'. I am able to connect to the databases on the network, but not to my local install. If I disconnect from the network, I can connect to my local install just fine. I realize it is most likely a configuration issue but I am at a loss as to how to fix this. I would very much like to connect to my local install while logged into the network. I have searched the forums and Google for a solution but have not found a situation that closely matched mine and the suggested solutions did not help. Any assistance you can offer would be greatly appreciated.
Here is the pertinent information about my laptop.
OS: Windows XP Professional x/Service Pack 3
Ram: 2 gb
CPU: Intel Core Duo 1.83 GHz
HDD: 80 Gb (45 gb free)
SQLNET.ora
# Defines the default domain.
NAMES.DEFAULT_DOMAIN = world
# Specifies the order of the naming methods that used for a client
# to resolve how to connect to a database.
NAMES.DIRECTORY_PATH= (HOSTNAME, ONAMES, TNSNAMES, EZCONNECT)
# Defines which Oracle Names servers should be used.
NAMES.PREFERRED_SERVERS =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(HOST = oranames1.mycompany.com)
(PORT = 1640)
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(HOST = oranames2.mycompany.com)
(PORT = 1640)
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(HOST = oranames3.mycompany.com)
(PORT = 1640)
NAMES.REQUEST_RETRIES = 1
SQLNET.AUTHENTICATION_SERVICES = (NTS)
sqlnet.expire_time=10
TNSNAMES.ora
# tnsnames.ora Network Configuration File: C:\oracle\product\10.2.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
ORACJB.world =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = oracjb))
EXTPROC_CONNECTION_DATA.WORLD=
(DESCRIPTION= (ADDRESS= (PROTOCOL=IPC) (KEY=EXTPROC))
(CONNECT_DATA= (PRESENTATION=RO) (SID=PLSExtProc))
MYCOTEST.WORLD=
(DESCRIPTION= (ADDRESS= (PROTOCOL=TCP) (HOST=mycompany.test.com) (PORT=1543) )
(CONNECT_DATA= (SERVICE_NAME=MYCOTEST.world)
MYCOPROD.WORLD=
(DESCRIPTION= (ADDRESS= (PROTOCOL=TCP) (HOST=mycompany.prod.com) (PORT=1549) )
(CONNECT_DATA= (SERVICE_NAME=MYCOPROD.world)
note: I've changed my company entries so they are generic, but suffice it to say, I am able to connect my company databases just fine.
Sincerely,
Craig...

Answer 1

Read the chapter about 'Installing Oracle on a non-networked computer' in the installation guide:
http://download.oracle.com/docs/cd/B19306_01/install.102/b14316/reqs.htm#BABFHCJG
Werner