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 220.127.116.11 to 18.104.22.168 [Release 11.2 to 12.2]
Information in this document applies to any platform.
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
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