Re: ORA-12535: TNS:operation timed out

From: <>
Date: Tue, 10 Mar 2009 13:05:40 -0400
Message-ID: <>

You're not doing sqlnet valid node checking are you? I've seen that when someone tries to connect but they are not in the allowed list of IP in sqlnet.ora file.


Joe Testa, Oracle Certified Professional Senior Consultant
Data Engineering and Administration
Nationwide Investments

(Work) 614-677-1668
(Cell) 614-312-6715

Interested in helping out your marriage? Ask me about "Weekend to Remember"
Dec 11-13, 2009 here in Columbus.

"Jiang, Lu" <>
03/10/2009 12:56 PM
ORA-12535: TNS:operation timed out
Sent by:

Hi All,  

I got ' ORA-12535: TNS:operation timed out' error while trying to connect to a database from my client machine via SQLPLUS. Database machine and my client machine are under different domains. The database port is already open to my client machine, tnsping works fine. The sqlplus connection to the database works fine on other client machines which under same domain as the db machine. And also sqlplus connections from my client machine to other databases work fine. Please help me on this issue.  

The following is the output on my client machine:  


SQL*Plus: Release - Production on Tue Mar 10 11:32:11 2009 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Enter user-name: system_at_ocval
Enter password:
ORA-12535: TNS:operation timed out  

H:\>tnsping ocval
TNS Ping Utility for 32-bit Windows: Version - Production on 10-MAR-2009 11:24:27
Copyright (c) 1997 Oracle Corporation. All rights reserved. Used parameter files:
C:\oracle\ora92\network\admin\sqlnet.ora Used TNSNAMES adapter to resolve the alias Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = ocdbval.vali
dated.mbl)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = ocval.validated.mbl)))
OK (20 msec)  


Received on Tue Mar 10 2009 - 12:05:40 CDT

Original text of this message