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Fatal NI connect error 12528 or 12537 in alert log during switchover (Doc ID 1471043.1)

Last updated on APRIL 03, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.3 to 11.2.0.3 [Release 10.2 to 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

The errors like:-

Fatal NI connect error 12528, connecting to:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(Host=xxxx)(port=1521))(CONNECT_DATA=(SERVICE_NAME=xxx)(CID=(PROGRAM=oracle)(HOST=xxxx)(USER=oracle))))

 and

FATAL NI CONNECT ERROR 12537

 in the alert log during switchover in a Data Guard environment

Changes

 Switchover of database in a Data Guard environment

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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