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post tail end of listener.log file right after this error occurs.
meta link gave me the followin info.
JDBC - Version: 126.96.36.199.0
This problem can occur on any platform.
Using 188.8.131.52 JDBC Thin driver to access a RAC cluster with the following connect string :
jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS_LIST =(LOAD_BALANCE=ON)(ADDRESS = (PROTO = TCP)(HOST =host2)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521)))(CONNECT_DATA =(SERVER =DEDICATED)(SERVICE_NAME = DB102)))
At connection time, the following exception is occuring :
java.sql.SQLException: Io exception: Connection refused (DESCRIPTION=(ERR=1153)(VSNNUM=153093632)(ERROR_STACK=(ERROR=(CODE=1153)(EMFI=4)(ARGS='(ADDRESS=(PROTO =TCP)(HOST=hostname)(PORT=1521))'))(ERROR=(ODE=305)(EMFI=1)))).]
The cause of this problem has been identified and verified in an unpublished Bug 2427185.
It is caused by the fact that the JDBC Thin does not support redirection to another NET listener
Upgrade the JDBC driver version to the latest version, for example 184.108.40.206.