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DBLink or Remote Connection Fails with: ORA-12523: TNS:listener could not find instance appropriate for the client (Doc ID 2454667.1)

Last updated on JANUARY 30, 2020

Applies to:

Oracle Net Services - Version 11.2.0.4 to 12.2.0.1 [Release 11.2 to 12.2]
Information in this document applies to any platform.

Symptoms

Select across a newly created database link  OR  remote connection using a TNS connect string fails with the following error:

SQL> select * from dual@DBLINK_NAME_HERE;


ORA-12523: TNS:listener could not find instance appropriate for the client connection

Cause

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In this Document
Symptoms
Cause
Solution


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