Fatal NI connect error 12547 after downgrade DB (Doc ID 1207226.1)

Last updated on SEPTEMBER 30, 2011

Applies to:

Oracle Net Services - Version: 10.2.0.2 and later   [Release: 10.2 and later ]
Information in this document applies to any platform.

Symptoms

TNS-12518: TNS:listener could not hand off client connection
TNS-12547: TNS:lost contact
 TNS-12560: TNS:protocol adapter error
  TNS-00517: Lost contact
   Solaris Error: 32: Broken pipe

Changes

If the Oracle database is upgraded, deemed to be working, but then downgraded back to the original version, connections may result in a TNS-12518.

Cause

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