ORA-12157 when using 10g Oracle client while 9i client on same machine connects (Doc ID 1174803.1)
Last updated on AUGUST 12, 2010
Oracle Net Services - Version: 10.2.0.4 and later [Release: 10.2 and later ] Information in this document applies to any platform.
When trying to connect to a remote Oracle Database using a 10g Oracle Client, the connection fails with an "ORA-12157: TNS:internal network communication error" However, when connecting to a remote Database using a 9i Oracle Client on the same client machine and using the exact same TNS files, the connection succeeds.
Migration of the Oracle client from 9i to 10g
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