Ora - 12203 error

Hi all
I installed oracle 9i and forms 6i on my home system. Operating system is window xp media center edition 2005. SQLl*plus working fine but when i tried to connect database from forms it is giving following error
ora-12203:tns:unable to connect destination.
Some one help me to solve this problem please.
Thanx in advance,
Ram.

Invalid TNS address supplied or destination is not listening.
This error can also occur because of underlying network transport problems.
Verify that the service name you entered on the command line was correct.
Ensure that the listener is running at the remote node and that the ADDRESS parameters specified in TNSNAMES.ORA are correct.
Finally, check that all Interchanges needed to make the connection are up and running.
Verify your tnsnames.ora entry matches the address where your listener is running. Example:
MyOwnDB =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = HostPCName)(PORT = 1521))
    (CONNECT_DATA =
      (SID = DatabaseSID)
)

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Since then, only the 10g tools work fine... and I cannot connect anymore to any of my Forms6i or Disco. BIG Problem !!!
The error is always the same : ORA-12203: TNS:unable to connect to destinationI have made many different tries for fixing this issue...but I have no clue, and I would like some advices from you.
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ORACLE_SID=SCFOXD
TWO_TASK=SCFOXD
and
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I currently put the same version of listener.ora, sqlnet.ora and tnsnames.ora in both directories (C:\orant\NET80\ADMIN and C:\10g\DB\NETWORK\ADMIN):
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SQLNET.ALLOWED_LOGON_VERSION = 9
SQLNET.AUTHENTICATION_SERVICES= (NTS)
TRACE_LEVEL_CLIENT = ADMIN
TRACE_UNIQUE_CLIENT = on
NAMES.DIRECTORY_PATH= (HOSTNAME, EZCONNECT, TNSNAMES)
TRACE_LEVEL_SERVER = ADMIN
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TRACE_DIRECTORY_SERVER = C:\orant\net80\admin
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SCFOXD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SID = SCFOXD)
(SERVER = DEDICATED)
(GLOBAL_NAME = SCFOXD)
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SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = SCFOXD)
(SID_NAME = SCFOXD)
LISTENER =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
Using the Dos command window, I stopped and started the listener (lsnrctl stop/start and its current status is (in french!!):
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 05-NOV. -2006 12:07:23
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connexion Ó (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUT du PROCESSUS D'ECOUTE
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Production
Date de départ 05-NOV. -2006 12:02:33
DurÚe d'activitÚ 0 jours 0 heures 4 min. 52 sec
Niveau de trace off
Sécurité ON: Local OS Authentication
SNMP OFF
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Fichier journal du processus d'écoute C:\10g\DB\network\log\listener.log
Récapitulatif d'écoute des points d'extrémité...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Récapitulatif services...
Le service "SCFOXD" comporte 1 instance(s).
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La commande a réussi
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To go further, I can reproduce the same error (like with Forms6i) when I use the DOS command window, when I run plus80.
Anyway, I am sure there is something I missed to do... but, I am really stuck, and I would like to get some advices in order to solve my issue.
Thanks,
Olivier

Thanks for your quick reply.
1) forms 6i version is = 6.0.8.23.2
2) in the DOS box, here is what I get :
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TNS Ping Utility for 32-bit Windows: Version 8.0.6.0.0 - Production on 06-NOV-06
21:25:38
(c) Copyright 1997 Oracle Corporation. All rights reserved.
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SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = SCFOXD)
(ORACLE_HOME = c:\10g\DB)
(SID_NAME = SCFOXD)
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SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
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SCFOXD = (DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA = (SID = SCFOXD))
(SRVR = DEDICATED) )
I really feel bad about my current configuration. I don't understand at all...
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$ oerr ora 12203
12203, 00000, "TNS:unable to connect to destination"
// *Cause: Invalid address specified or destination is not listening.
// This error can also occur because of underlying network or network
// transport problems.
// *Action: Verify that the net service name you entered was correct.
// Verify that the ADDRESS portion of the connect descriptor which
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hi;
when i open report and connect with oracle then not accept my id and password
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ERROR ORA-12203: TNS: unable to connect to destination

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Your oracle database and forms are installed on different oracle home so when you configurate your sql net that time you are configurating only your oracle database. So for form you must be having different oracle home. you cand change thid from start/oracle inatallation products/home selecter. so change our home and run the form. and if still having problem than check for tnsnames.ora file you must be having two files and both must be having right configuration.
thanks

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Hi,
I am trying to install Oracle 8i and oracle Forms and reports on my personal system for prectise purpose,
I have window XP on my system and I installed Oracle Forms & Reports first on my system in C: drive,
then I installed Oracle 8i(sql, pl/sql) in D: drive on my system, both installed successfully
but whenever I am trying to connect oracle(sql)
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ORA-12203 TNS : Unable to connect to destination.
Please suggest how can I solve that problem.
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Moved to   Forum Home » Database » Database - General as it itsn't an SQL and PL/SQL question.
>
ORA-12203:
     TNS:unable to connect to destination
Cause:      Invalid address specified or destination is not listening. This error can also occur because of underlying network or network transport problems.
Action:      Verify that the net service name you entered was correct. Verify that the ADDRESS portion of the connect descriptor which corresponds to the net service name is correct. Ensure that the destination process (for example the listener) is running at the remote node.

Ora - 12203 error

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