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Intermittent Connection Errors ORA-17002 Using JDBC And SQL*Plus Client While Connecting To RAC (Doc ID 399136.1)

Last updated on JULY 27, 2018

Applies to:

Oracle Net Services - Version 10.2.0.3.0 and later
JDBC - Version 10.1.0.2 and later
Information in this document applies to any platform.
***Checked for relevance on 05-Mar-2013***


Symptoms

Intermittent failures to connect JDBC/thin to a RAC database with error:

IOException: The network adapter could not establish the connection. ( ORA-17002)


Connection string is

 

Connection to individual nodes always works:

jdbc:oracle:thin:@nnn.nnn.nnn.1:1521:sid1
Or this:
jdbc:oracle:thin:@nnn.nnn.nnn.2:1521:sid2

Cause

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