Local Connections Work, Connecting Via Listener To The Database Fails With ORA-01034 ORA-27101

(Doc ID 375688.1)

Last updated on NOVEMBER 06, 2017

Applies to:

Oracle Net Services - Version 10.2.0.1 to 11.2.0.4 [Release 10.2 to 11.2]
Oracle Net Services - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Information in this document applies to any platform.

Symptoms

On a system with multiple IP addresses, when we connect with sqlplus locally on the server (i.e. "sqlplus user/password") everything is OK, but connecting through a TNS alias, either from the network or locally on the server, we get the the following errors:

sqlplus user/password@db_alias

ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
SVR4 Error: 2: No such file or directory 



Changes

May be triggered by:

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms