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 188.8.131.52 and later
Any type of connection failed with below error.
C:\Users\xxx>sqlplus / as sysdba
SQL*Plus: Release 184.108.40.206.0 Production on Tue Jan 15 10:24:11 2019
Copyright (c) 1982, 2013, Oracle. All rights reserved.
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.
Windows application log shows errors related Oracle database service.
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