10gR2 and Newer: Connections Intermittently Fail with ORA-3136 (Doc ID 3136.1)

Last updated on MAY 25, 2016

Applies to:

Oracle Net Services - Version 10.2.0.2 to 12.1.0.2 [Release 10.2 to 12.1]
Information in this document applies to any platform.

Symptoms

The Oracle Net 10gr2 parameters SQLNET.INBOUND_CONNECT_TIMEOUT and INBOUND_CONNECT_TIMEOUT_listenername now default to 60 seconds.  


If any client fails to provide credentials or for any reason cannot complete the authentication process in 60 seconds or less, these error will be thrown

in the alert.log:

WARNING: inbound connection timed out (ORA-3136)

Cause

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