Last updated on APRIL 13, 2017
Applies to:Oracle Net Services - Version: 188.8.131.52
Information in this document applies to any platform.
After upgrading a second database instance from 10gR2 to 11gR2 (184.108.40.206) on the same machine, unable to connect to the original 11gR2 database instance that was previously working fine.
ORA-12523: TNS:listener could not find instance appropriate for the client after 11g upgrade
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