TNS:connection timeout error

Hi,
I have installed oracle 10g in my system.
the tnsnames.ora file contails the following:
TEST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.2)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = test)
and sqlnet.ora file contains :
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
when i'm trying to login from SQLPLUS as:
sqlplus sys/<password>@<sid> as sysdba
it's showing the error as "ORA-12170 :TNS: connect timeout occured"
C:\Documents and Settings\Administrator>sqlplus sys/<password>@<sid> as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Wed Sep 10 09:47:56 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
ORA-12170: TNS:Connect timeout occurred
Enter user-name: sys as sysdba
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL>
But i coudnot connect to Enterprise manager and through Toad because it tells as "TNS:connect timeout occured".
From enterprise manager it shows the instance,listener are down.
trying to start up the instance shows as "not connected to oracle".
Could you please help me for this.
Thanks,
Souvik

user10223265 wrote:
This may help
http://www.errorkey.com/search/Index.aspx?q=TNS-12541
Is this the best you have to offer? I see you keep on posting "+answers+" using this URL. Well, if this is all you have to offer it is pretty pathetic. Please do not bother as there are many here that will actually make an effort to assist the person with the problem. We do not want you to sprain a finger or break a nail looking up the errorkey URL for yet another error code.
Re: why handling ora-01722 with pl/sql not works ???

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Post moved to:
Handling the ORA-12170: TNS:Connect timeout in a procedure
Edited by: John_75 on Jun 28, 2010 9:33 AM

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John,
I had the same problem when I upgraded from Tiger to Leopard in January. My memory is already rusty but try the following:
1. Go to System Preferences > Network pane. On the left pane, click on AirPort. In the right pane lower right, click Advanced button. Then on the AirPort tab, click on the name of your network and then the minus sign to remove it from the list.
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6. Click Apply and Quit the Network Preferences.
7. On the Menu row, click the Airport icon and select your network. (IF your network does not show, choose Join Other Network. Fill in the Network Name, choose the type of Security by clicking on the pop-down bar, enter password/code/phrase and click Join.)
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I am getting CONNECTION TIMEOUT error in my macbook(10.7.4).plzzz help me

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