Local SQL*Plus Connection failing with ORA-12560: TNS:protocol adapter error
(Doc ID 2531667.1)
Last updated on AUGUST 23, 2021
Applies to:
Oracle Database - Enterprise Edition - Version 10.1.0.2 and later
Information in this document applies to any platform.
Symptoms
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
Enter password:
ERROR:
ORA-12560: TNS:protocol adapter error
Changes
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
Cause
| |
To view full details, sign in with your My Oracle Support account. |
|
| Don't have a My Oracle Support account? Click to get started! |
In this Document
My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.