ORA-12537 TNS Connection closed after OAS 4.0.8.1 Installation

finally I was able to install and start OAS
on RH 6.1, but now I can not start Ora8i (with all patches) on my system. When I start svrmgrl, will get ora-12537 TNS Connection lost error.
Can someone please help!
Thanks

They said in the install doc that you can't use the same ORACLE_HOME for 8i and OAS 4.0.8...

Similar Messages

Ora - 12537 tns connection closed

hai folks,
when i am connecting to database from toad software it throwhn error like this.
in which files i will update regarding tnsnames.ora file.
Regards
dba

You need to register the hosts which you want to give SQL*Plus/TOAD access as nodes.
From OAM, navigate to Site Map > Administration > System Configuration > Hosts > Register.
You may also comment "tcp.validnode_checking = yes" but this will allow any client to be able to connect to the Database.
For more details, please refer to Note: 291897.1 - 11.5.10 New Features : Managed SQL*Net Access from Hosts
https://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=291897.1

TNS-12537: TNS:connection closed & ORA-609

hello all,
did any body see this error and solved it ?
TNS-12537: TNS:connection closed
ns secondary err code: 12560
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
opiodr aborting process unknown ospid (19995) as a result of ORA-609
if yes could you please explain to me how to fix it ?
note :
database Version 11.2.0.2.0
Sun Solaris
Edited by: 869111 on 24/02/2013 12:18 م
Edited by: 869111 on 24/02/2013 12:27 م

Check the following parameters in sqlnet.ora file:
tcp.invited_nodes
tcp.excluded_nodes

ORA-12537: TNS Connectio Closed

Hi,
I have Production Database Servers. The name of Production Databse Server is CB02DB1 on which we are running Oracle 9i Release 2 (64 Bit) version. This database contain our ERP database and we want to restrict some users to access databse. For this Purpose I set the Parameters
TCP.VALIDNODE_CHECKING=YES
TCP.INVITED_NODES=(DBPROD)
in my sqlnet.ora file.
Now the Problem is that we have another server whose name is DBPROD. Which contain Oracle Financial Application with 8.1.7.0.0 version database. Oracle Financial is Intigrated with our ERP. when I given the name of DBPROD in
TCP.INVITED_NODES on CB0DB1 sqlnet.ora file and restart the listener.
Now when we connect to 9i databse from DBPROD machine it gives the error
ORA-12537: TNS Connectio Closed.
Any body Help me. It is Urgent.
Regards,

Let me clarify your question, it is not totally clear to me:
You have a database on node A.
You want to allow connections only from node B.
You try to achieve this with TCP.INVITED_NODES.
It does not work, B cannot connect to the database on A.
Did I understand your problem?
Try the following:
Write B's FULL name into TCP.INVITED_NODES - does it work then?
From A, try to ping B using the full name. Does it work?
Examine listener.log on node A. Can you find an explanation?
If you are still at loss, turn on tracing for the listener, try to connect and look at listener.log again.
Yours,
Laurenz Albe

How to resolve TNS-12537: TNS:connection closed

sqlnet.ora
==========
# 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)
#SQLNET.AUTHENTICATION_SERVICES = (ALL)
tnsname.ora
===========
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ORCL)
listener.ora
========
# listener.ora Network Configuration File: D:\oracle\product\10.2.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
while trying to connect into my local database(ORCL),I am receiving the following error:
C:\Documents and Settings\abcd>tnsping orcl
TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 07-JUN-2
012 11:16:44
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
D:\oracle\product\10.2.0\db_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = 127.0.0.1)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = ORCL)))
TNS-12537: TNS:connection closed
Thanks in advance.

Hi,
In your tnsnames.ora description ORCL.
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ORCL)
) Did you create any database on localhost (HOST = 127.0.0.1)?
I think , if you want you must create database on localhost with IP 127.0.0.1
else if you want connect exists database with service name ORCL then you must change IP address
for ORCL description in tnsname.ora (for expale HOST= ORCLHOST or IP )
regards
Mahir M. Quluzade
www.mahir-quluzade.com

TNS-12537: TNS:connection closed

Hi,
I have done system copy on AIX/oracle. On new server if start the listner. it starts normally. Oracle also starts normal. Then if i starts sap with sidadm, listner stops with following error. There is no error In listner.log file.
orascp 11> lsnrctl status
LSNRCTL for IBM/AIX RISC System/6000: Version 10.2.0.2.0 - Production on 28-SEP-2008 12:11:15
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=IPC)(KEY=SCP.WORLD))
TNS-12537: TNS:connection closed
TNS-12560: TNS:protocol adapter error
TNS-00507: Connection closed
Connecting to (ADDRESS=(PROTOCOL=IPC)(KEY=SCP))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
IBM/AIX RISC System/6000 Error: 79: Connection refused
Connecting to (ADDRESS=(COMMUNITY=SAP.WORLD)(PROTOCOL=TCP)(HOST=sppprd)(PORT=1527))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
IBM/AIX RISC System/6000 Error: 79: Connection refused

Hi Sanjay,
check below notes
Note 1182020
Note 441518
Regards
Ashok

ORA-12537:TNS:TNS connection closed

i am getting this error while connecting to sqlplus. please suggest.

This error means:
ORA-12537: TNS:connection closed
Cause: "End of file" condition has been reached; partner has disconnected.
Action: None needed; this is an information message.
Which simply means your connection has ended. It is just an informative message, actually this doesn't mean an error arised.
Please provide further details on the environment where this error was produced as well as the Oracle and OS versions.
~ Madrid

TNS: connection closed error with SQL*net

Hi all,
I've got a new installation of Oracle 11.1.0.6.0 enterprise (Linux). It works fine with direct sqlplus connections but I'm having problems with SQL*net and JDBC thin client connections.
The database is built correctly and works fine:
user@cthulhu bash[61]: sqlplus user/pwd
SQL*Plus: Release 11.1.0.6.0 - Production on Mon Aug 4 12:59:53 2008
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE 11.1.0.6.0 Production
TNS for Linux: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
SQL>
but if I try to connect using SQL*net I get errors. I have my TNS listener configured and it starts without errors, reporting the database as a service, and tnsping is fine:
user@cthulhu bash[62]: tnsping cthulhu_mar
TNS Ping Utility for Linux: Version 11.1.0.6.0 - Production on 04-AUG-2008 13:02:07
Copyright (c) 1997, 2007, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION= (ADDRESS=(PROTOCOL=TCP)(HOST=192.168.2.30)(PORT=1521)) (CONNECT_DATA=(SID=mar)))
OK (10 msec)
user@cthulhu bash[63]: sqlplus user/pwd@cthulhu_mar
SQL*Plus: Release 11.1.0.6.0 - Production on Mon Aug 4 13:02:41 2008
Copyright (c) 1982, 2007, Oracle. All rights reserved.
ERROR:
ORA-12537: TNS:connection closed
Enter user-name:
In listener.log:
Mon Aug 04 13:02:41 2008
04-AUG-2008 13:02:41 * (CONNECT_DATA=(SID=mar)(CID=(PROGRAM=sqlplus)(HOST=cthulhu)(USER=marbur))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.30)(PORT=41754)) * establish * mar * 12518
TNS-12518: TNS:listener could not hand off client connection
TNS-12547: TNS:lost contact
TNS-12560: TNS:protocol adapter error
TNS-00517: Lost contact
Linux Error: 32: Broken pipe
This is a new instance of Oracle so there is no problem with listener.log being too large (as I've seen elsewhere). I've also tried increasing PROCESSES and SESSIONS in the initSID.ora file without any impact. The listener ports are open through the firewall (and disabling it temporarily makes no difference).
Any suggestions?!
Thanks, Matt

This means nothing to me, but it could to someone else......
from listener trace:
2008-08-04 16:19:05.135381 : nlpcaini:env[161] = OLDPWD=/u01/app/oracle/product/11.1.0/db_1
2008-08-04 16:19:05.135407 : nlpcaini:env[162] = ORA_NET2_DESC=12,15
2008-08-04 16:19:05.135432 : nlpcaini:env[163] = ORACLE_SPAWNED_PROCESS=1
2008-08-04 16:19:05.135465 : nlpcaini:exit
2008-08-04 16:19:05.135498 : nsc2addr:normal exit
2008-08-04 16:19:05.135536 : nsbeqaddr:entry
2008-08-04 16:19:05.135566 : nsbeqaddr:connecting...
2008-08-04 16:19:05.135603 : nsopen:entry
2008-08-04 16:19:05.135633 : nsmal:entry
2008-08-04 16:19:05.135667 : nsmal:1012 bytes at 0x81a8538
2008-08-04 16:19:05.135694 : nsmal:normal exit
2008-08-04 16:19:05.135722 : nsopenmplx:entry
2008-08-04 16:19:05.135749 : nsmal:entry
2008-08-04 16:19:05.135779 : nsmal:2020 bytes at 0x81a8930
2008-08-04 16:19:05.135804 : nsmal:normal exit
2008-08-04 16:19:05.135831 : nsiorini:entry
2008-08-04 16:19:05.135861 : nsbal:entry
2008-08-04 16:19:05.135889 : nsbgetfl:entry
2008-08-04 16:19:05.135918 : nsbgetfl:normal exit
2008-08-04 16:19:05.135966 : nsmal:entry
2008-08-04 16:19:05.135995 : nsmal:84 bytes at 0x81b3dd8
2008-08-04 16:19:05.136020 : nsmal:normal exit
2008-08-04 16:19:05.136057 : nsbal:normal exit
2008-08-04 16:19:05.136085 : nsiorini:exit (0)
2008-08-04 16:19:05.136112 : nscpxget:entry
2008-08-04 16:19:05.136139 : nscpxget:normal exit
2008-08-04 16:19:05.136168 : nsopenalloc_nsntx:nlhthput on mplx_ht_nsgbu:ctx=81a8538, nsntx=81a8930
2008-08-04 16:19:05.136196 : nsopenmplx:normal exit
2008-08-04 16:19:05.136225 : ntpcon:entry
2008-08-04 16:19:05.136253 : ntpcon:toc = 6
2008-08-04 16:19:05.136283 : ntpcon:exit
2008-08-04 16:19:05.136313 : nsopen:opening transport...
2008-08-04 16:19:05.136341 : ntpcon:entry
2008-08-04 16:19:05.136367 : ntpcon:toc = 1
2008-08-04 16:19:05.136404 : sntpcall:entry
2008-08-04 16:19:05.157048 : sntpcall:detaching from parent with additional fork
2008-08-04 16:19:05.157304 : sntpcall:hdl[IR]=17, hdl[IW]=16
2008-08-04 16:19:05.157350 : ntpcon:exit
2008-08-04 16:19:05.157390 : nserror:entry
2008-08-04 16:19:05.157428 : nsoptions:entry
2008-08-04 16:19:05.157459 : nsoptions:lcl[0]=0x0, lcl[1]=0x2006, gbl[0]=0x0, gbl[1]=0x0, cha=0x0
2008-08-04 16:19:05.157488 : nsoptions:Vectored IO not supported.
2008-08-04 16:19:05.157518 : nsoptions:lcl[0]=0xf4ffe9ff, lcl[1]=0x6016, gbl[0]=0xe881, gbl[1]=0x0
2008-08-04 16:19:05.157545 : nsoptions:normal exit
2008-08-04 16:19:05.157574 : nsnainit:entry
2008-08-04 16:19:05.157603 : nsnainit:normal exit
2008-08-04 16:19:05.157642 : nsopen:global context check-in (to slot 6) complete
2008-08-04 16:19:05.157675 : nsopen:lcl[0]=0xf4ffe9ff, lcl[1]=0x6016, gbl[0]=0xe881, gbl[1]=0x0, tdu=4096, sdu=8192
2008-08-04 16:19:05.157706 : nsfull_opn:entry
2008-08-04 16:19:05.157735 : nsfull_opn:cid=6, opcode=65, bl=0, what=0, uflgs=0x0, cflgs=0x0
2008-08-04 16:19:05.157761 : nsfull_opn:nsctx: state=7, flg=0x4001, mvd=0
2008-08-04 16:19:05.157790 : nsfull_opn:normal exit
2008-08-04 16:19:05.157816 : nsopen:normal exit
2008-08-04 16:19:05.157854 : nsevreg:entry
2008-08-04 16:19:05.157884 : nsevreg:begin registration process for 6
2008-08-04 16:19:05.157912 : nsevregPrePost:entry
2008-08-04 16:19:05.157940 : nsevregPrePost:normal exit
2008-08-04 16:19:05.157968 : nsevreg:sgt=0, evn=1, evt[2]=0x0
2008-08-04 16:19:05.157996 : nsevreg:begin notification process for 6
2008-08-04 16:19:05.158022 : nsevregAffectNotif:entry
2008-08-04 16:19:05.158050 : nsevregAffectNotif:exit (0)
2008-08-04 16:19:05.158078 : nsevreg:rdm=0, sgt=0, evt[0]=0x800, [1]=0x800, [2]=0x0, nrg=0
2008-08-04 16:19:05.158105 : nsevreg:registering for 0x800
2008-08-04 16:19:05.158135 : ntpctl:entry
2008-08-04 16:19:05.158162 : ntpctl:exit
2008-08-04 16:19:05.158203 : nsevreg:normal exit
2008-08-04 16:19:05.158260 : nsbeqaddr:error exit
2008-08-04 16:19:05.158289 : nsbequeath:error exit
2008-08-04 16:19:05.158342 : nsglhe:exit

SQLPLUS TNS Connection Closed

Hi,
Each time I attempt to use SQLPLUS to connect to my db, I receive:
ERROR:
ORA-12537: TNS:connection closed
The listener.log contains these entries:
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
06-JAN-2012 17:09:51 * <unknown connect data> * (ADDRESS=(PROTOCOL=tcp)(HOST=172.19.1.54)(PORT=50067)) * establish * <unknown sid> * 12525
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
06-JAN-2012 17:10:23 * ping * 0
06-JAN-2012 17:10:23 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=SYSTEM))(COMMAND=status)(ARGUMENTS=64)(SERVICE=(ADDRESS=(PROTOCOL=TCP)(HOST=SERVER01.domain.local)(PORT=1521)))(VERSION=169870336)) * status * 0
06-JAN-2012 17:10:54 * <unknown connect data> * (ADDRESS=(PROTOCOL=tcp)(HOST=172.19.1.54)(PORT=50074)) * establish * <unknown sid> * 12525
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
Earlier today, I could log in without problems. I had been experiencing this error on my first attempt to login, but if I immediately attempted a second connection, would be logged in. Now, I cannot connect. Nothing has changed otherwise. Does anyone have any idea what may be causing this? I am using the sql plus command prompt, on a Windows Server 2008 R2 Service Pack 1. Oracle 10.2.0.4 Production, 64-bit.
Thank you,
Jesse

jesserose wrote:
Hi,
Each time I attempt to use SQLPLUS to connect to my db, I receive:
ERROR:
ORA-12537: TNS:connection closed
The listener.log contains these entries:
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
06-JAN-2012 17:09:51 * <unknown connect data> * (ADDRESS=(PROTOCOL=tcp)(HOST=172.19.1.54)(PORT=50067)) * establish * <unknown sid> * 12525
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
06-JAN-2012 17:10:23 * ping * 0
06-JAN-2012 17:10:23 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=SYSTEM))(COMMAND=status)(ARGUMENTS=64)(SERVICE=(ADDRESS=(PROTOCOL=TCP)(HOST=SERVER01.domain.local)(PORT=1521)))(VERSION=169870336)) * status * 0
06-JAN-2012 17:10:54 * <unknown connect data> * (ADDRESS=(PROTOCOL=tcp)(HOST=172.19.1.54)(PORT=50074)) * establish * <unknown sid> * 12525
TNS-12525: TNS:listener has not received client's request in time allowed
TNS-12535: TNS:operation timed out
TNS-12606: TNS: Application timeout occurred
Earlier today, I could log in without problems. I had been experiencing this error on my first attempt to login, but if I immediately attempted a second connection, would be logged in. Now, I cannot connect. Nothing has changed otherwise. Does anyone have any idea what may be causing this? I am using the sql plus command prompt, on a Windows Server 2008 R2 Service Pack 1. Oracle 10.2.0.4 Production, 64-bit.
Thank you,
JesseIt could be a mal-formed connection request due to bad tnsnames entry.
what is actual & complete connection string being issued?
post content of tnsnames.ora
post content of sqlnet.ora file if one exists
post results from following OS commands run on DB Server system
lsnrctl status
lsnrctl service

Connection closed after many connect/disconnect

Hi!
I'm connecting and disconnecting through OCCI many times in short term. After disconnect I run SQL*Loader through system command (in C). When number of that connect/disconnect pair reached about 128 I receive:
SQL*Loader-704: Internal error: ulconnect: OCIServerAttach [0]
ORA-12537: TNS:connection closedWhat should I do to fix this? Maybe some initialize parameter should be changed?

You are probably not releasing the connection handles properly.
Most likely that you are holding the 128 connection objects.
terminateConnection should be called before connecting again.
You can see how many connections are active in Oracle Server

TNS:connection closed

Dear Experts,
My database 10gR2 and OS:Win2003R2 sp2-32 bit. My listener throw the error like below. In between i am getting this errors.
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=PUBLICLAN1)(PORT=1521)))
TNS-12537: TNS:connection closed
TNS-12560: TNS:protocol adapter error
TNS-00507: Connection closed
Could you give some valuable advice.
Thanks and Regards
Sundar

Thanks,
My hosts file contents inclued IP address and name of the server.
Just now i checked my listener service.I got it like that.
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.0.198.55)(PORT=1521))
Services Summary...
Service "DHSW.GOV.BH" has 1 instance(s).
Instance "dhsw", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1469 refused:0 state:ready
LOCAL SERVER
Service "DHSWXDB.GOV.BH" has 1 instance(s).
Instance "dhsw", status READY, has 1 handler(s) for this service...
Handler(s):
"D000" established:0 refused:0 current:0 max:1002 state:ready
DISPATCHER <machine: HIS-SRV1, pid: 4056>
(ADDRESS=(PROTOCOL=tcp)(HOST=his-srv1.dhsa.gov.bh)(PORT=1109))
Service "DHSW_XPT.GOV.BH" has 1 instance(s).
Instance "dhsw", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1469 refused:0 state:ready
LOCAL SERVER
The command completed successfully
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.0.198.55)(PORT=1521))
TNS-12537: TNS:connection closed
TNS-12560: TNS:protocol adapter error
TNS-00507: Connection closed
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.0.198.55)(PORT=1521))
Services Summary...
Service "DHSW.GOV.BH" has 1 instance(s).
Instance "dhsw", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1484 refused:0 state:ready
LOCAL SERVER
Service "DHSWXDB.GOV.BH" has 1 instance(s).
Instance "dhsw", status READY, has 1 handler(s) for this service...
Handler(s):
"D000" established:0 refused:0 current:0 max:1002 state:ready
DISPATCHER <machine: HIS-SRV1, pid: 4056>
(ADDRESS=(PROTOCOL=tcp)(HOST=his-srv1.dhsa.gov.bh)(PORT=1109))
Service "DHSW_XPT.GOV.BH" has 1 instance(s).
Instance "dhsw", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1484 refused:0 state:ready
LOCAL SERVER
The command completed successfully
Regards
Sundar

ORA-12564: TNS:connection refused

C# code:
private Oracle.DataAccess.Client.OracleConnection objConn;
objConn.ConnectionString = "User Id=tst;Data Source=CZETEST;Password=1234;"
objConn.Open();
tnsnames.ora
CZETEST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = XXX.NET)(PORT = 1621))
(CONNECT_DATA =
(SERVICE_NAME = XXX.CZ)
I'm trying to connect to an Oracle 10g server.
objConn.Open(); always ends with "ORA-12564: TNS:connection refused"
I've even tried to let the connection build by ODT connection wizzard ('Test connection' button displays 'Connection was successfull', but when the code is run the result is unfortunately the same :(
Anybody knows where the problem should be?

This is often a malformed tnsnames.ora. Is what you posted a snippet, because it looks to me that you a closing ) too many. You can turn on tracing which should help you find the problem. It's odd that odt says the connection works, though.

Handling the ORA-12170: TNS:Connect timeout in a procedure

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

http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/troublestng.htm#i440403
will give you
http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/troublestng.htm#CEGEDBIE

ORA-12170:TNS:Connect timeout occurred

Hi, I am no longer able to log into SQL Plus. I get the error message above. I think the problem comes from my comtputer being renamed. Can someone help me?
Thanks.

ORA-12170:TNS:Connect timeout occurred
Cause: The server shut down because connection establishment or communication with a client failed to complete within the allotted time interval. This may be a result of network or system delays; or this may indicate that a malicious client is trying to cause a Denial of Service attack on the server.
Action: If the error occurred because of a slow network or system, reconfigure one or all of the parameters SQLNET.INBOUND_CONNECT_TIMEOUT, SQLNET.SEND_TIMEOUT, SQLNET.RECV_TIMEOUT in sqlnet.ora to larger values. If a malicious client is suspected, use the address in sqlnet.log to identify the source and restrict access. Note that logged addresses may not be reliable as they can be forged (e.g. in TCP/IP).
1. Check whether database is up and running.
2. tnsping <databasename> and see whether you are able to ping the database in command prompt.
3. Check tnsnames are configured properly.
4. check DNS entry in your host file.
Regards,
Syed

Logging in Oeacle SQL*Plus (ORA-12170: TNS: Connect timeout occured) ...

I installed recently Oracle 10g. When I try to log in, with the account and password setup[ earlier, I get the message "ORA-12170: TNS: Connect timeout occured". Do I need to specify a Host String" at Log On? Should I un-install and re-install the software again? Thank you.

/* Error:     ORA-12170 (ORA-12170)
Text:     TNS:Connect timeout occurred
Cause:     The server shut down because connection establishment with a
     client failed to complete within the allotted time interval. This
     may be a result of network/system delays; or this may indicate
     that a malicious client is trying to cause a Denial of Service
     attack on the server.
Action:     If the error occurred because of a slow network/system,
     reconfigure the SQLNET.INBOUND_CONNECT_TIMEOUT parameter in
     sqlnet.ora to a larger value. If a malicious client is suspected,
     use the address in sqlnet.log to identify the source and restrict
     access. Note that logged addresses may not be reliable as they can
     be forged (e.g. in TCP/IP).
Could also be a firewall issue.
Werner

ORA-12537 TNS Connection closed after OAS 4.0.8.1 Installation

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