ORA-12541 with failover using a Client lower than 11.2 to SCAN Listener (Doc ID 1365631.1)

Last updated on JANUARY 21, 2015

Applies to:

Oracle Net Services - Version 11.2.0.2 to 11.2.0.2 [Release 11.2]
Information in this document applies to any platform.

Symptoms

When testing fail over capabilities OR when a failover condition occurs, you notice that clients connecting through the 11.2 SCAN Listener address fail to re-establish the connection with an ORA-12541 "TNS:no listener" error.
The clients are 11.1 or lower and might include 11.1 or lower JDBC Thin Clients / drivers.

Changes

Fail over testing or actual fail over condition with an 11.2 RAC environment and active-active nodes.

Cause

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