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Local Connections Not Working For A DB In Windows : ORA-12560: TNS:protocol Adapter Error (Doc ID 2499416.1)

Last updated on JANUARY 29, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Generic Windows

Symptoms

Any type of connection failed with below error. 


C:\Users\xxx>sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue Jan 15 10:24:11 2019
Copyright (c) 1982, 2013, Oracle. All rights reserved.

ERROR:
ORA-12560: TNS:protocol adapter error

Application connections, local connection (non sys) also impacted with same error



Window Services is up and running. Listener service also running.

All environment variables are properly set, No issue found with registry values.

Binaries permission as are properly set. 

Delete and re-creating the service also dint solved the issue. 

Changes

Windows  application log shows errors related Oracle database service. 

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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