Local SQL*Plus Connection failing with ORA-12560: TNS:protocol adapter error
(Doc ID 2531667.1)
Last updated on AUGUST 23, 2021
Oracle Database - Enterprise Edition - Version 10.1.0.2 and later
Information in this document applies to any platform.
sqlplus / as sysdba (Bequeath) or connecting using other non-sysdba users is failing with ORA-12560: TNS:protocol adapter error
Enter user-name: sys as sysdba
ORA-12560: TNS:protocol adapter error
There are several changes which can lead to this error. Below are few of the them
- Incomplete Upgrade or patching
- Using Incorrect PATH / Environment Variables to startup the instance
- Security products
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