Unable To Authenticate Session or Unable to create session is one of the most common errors in R12 instance
ERROR
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"Unable to authenticate session"
This can happen after the instance is cloned or any changes happened to the system with wrong parameter
The first log which you should check in case of this error is
$INST_TOP/logs/ora/10.1.3/j2ee/oacore/oacore_default_group_1/application.log
Here are some common errors which you might see
Error 1
html: chain failed javax.servlet.ServletException: java.lang.RuntimeException: Unable to create user session. Please contact your System Administrator.
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) ].server.http.EvermindPageContext.handlePageThrowable(EvermindPageContext.java:780) Error 2
oracle.apps.fnd.framework.OAException: Could not load application module
'oracle.apps.fnd.sso.login.server.MainLoginPageAM'.
Detail 0 ##
oracle.apps.fnd.framework.OAException: Application: ICX, Message Name: ICX_SESSION_FAILED.
How to solve the issue
(1) First check if the R12.0/R12.1 is in maintenance Mode .If it is still in Maintenance mode.
Disable it
sqlplus apps/apps @$AD_TOP/patch/115/sql/adsetmmd.sql DISABLE
Bounce all the services
$ADMIN_SCRIPTS_HOME/adopmnctl.sh stopall $ADMIN_SCRIPTS_HOME/adopmnctl.sh startall
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