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Thursday 3 April 2014

Oracle client error TNS-12541: TNS:no listener Error

Oracle client throwing an error as below while connecting a database.

E.g. - Error 1
An error was encountered performing the requested operation: The Network Adapter could not establish the connection ( Vendor code 20 )
E.g. - Error 2
User Not able to start "OracleOraDb11g_home1TNSListener" Service
Service path (D:\app\DHIRAJG\product\11.2.0\dbhome_1\BIN\TNSLSNR)
E.g. - Error 3
ORA-12541: TNS:no listener

Cause :
Unable to start "OracleOraDb11g_home1TNSListener" Service.
Changes made in "sqlnet.ora" file

Solution :
Revert the changes in the "sqlnet.ora" file  ( Check Default file as follows )


Edit the "sqlnet.ora" file located in default path as below and revert the all changes made in the same according to above snap.

Default Path : "D:\app\dhirajg\product\11.2.0\dbhome_1\network\admin\sqlnet.ora"

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