My Oracle Support Banner

Connection to Auxiliary using connect string failed with ORA-12528 (Doc ID 419440.1)

Last updated on AUGUST 08, 2023

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.1 to 12.2]
Oracle Net Services - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Information in this document applies to any platform. *** ***


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.




To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.