Connection to Auxiliary using connect string failed with ORA-12528

(Doc ID 419440.1)

Last updated on MARCH 12, 2018

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.1 to 12.2]
Oracle Net Services - Version and later
Information in this document applies to any platform.
***Checked for relevance on 21-May-2015***
***Checked for relevance on 26-Oct-2016***


Duplicate database fails while trying to connect to auxiliary instance.

Connection from target database server to the auxiliary database  fails with error:

ORA-12528: TNS:listener: all appropriate instances are blocking new connections.




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