Local Connections Work, Connecting Via Listener To The Database Fails With ORA-01034 ORA-27101
(Doc ID 375688.1)
Last updated on JANUARY 21, 2024
Applies to:
Oracle Net Services - Version 12.1.0.2 to 18.1.0.0.0 [Release 12.1 to 18.1] Oracle Database - Enterprise Edition - Version 12.2.0.1 to 12.2.0.1 [Release 12.2] 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:
Changes
May be triggered by:
SID_LIST_<listener> changes in LISTENER.ORA
Listener port/host reconfiguration
Using (IP=FIRST) in LISTENER.ORA
Database startup scripts changes
Oracle user environment changes
Cause
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