E-IB: IBRequest:setFromPS_XML(). Invalid content section in IBInfo. (Doc ID 2175790.1)

Sample Environment:
------------------

Tools 8.54.15
FSCM 9.2 Image 17
Issue in Prod and Test environments

Issue:
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The site has recently upgraded to tools 8.54.15 and FSCM 9.2. Old environment was 8.49.26 and FSCM 9.0. And the gateway being used was from site's CS 9.0 environment which was on tools 8.52  (it was the highest tools level at the time i.e between 8.52 for CS and 8.49 FMS environments).

Prior to the upgrade, a 3rd party was able to send message into CS 9.0 environment.
After the above mentioned upgrade, the site is now using gateway from FSCM.  3rd party when attempting to send message is getting timeout error.

To attempt to troubleshoot, the site rep tried to place https://server:port/PSIGW/HttpListeningConnector  URL in the browser.
This is when the site rep got the below error in the browser:

<?xml version="1.0"?>
-<IBResponse type="error">
<DefaultTitle>Integration Broker Response</DefaultTitle>
<StatusCode>20</StatusCode>
<MessageSet>158</MessageSet>
<MessageID>10403</MessageID>
<DefaultMessage> Integration Gateway failed while processing the message. </DefaultMessage>
-<MessageParameters>
<Parameter>ContentSection</Parameter>
</MessageParameters>
</IBResponse>


And the gateway errorLog.html  shows :


2016-08-24 08:56:32.944 Type   Error
 ErrorLevel   Standard Gateway Exception
 Description   IBRequest:setFromPS_XML(). Invalid content section in IBInfo.
Exception     HTTPListeningConnector: MessageUnmarshallingException.
MessageCatalog   MessageSet:   MessageID:   MessageParms:  ContentSection
Stack Trace
com.peoplesoft.pt.integrationgateway.common.MessageUnmarshallingException: IBRequest:setFromPS_XML(). Invalid content section in IBInfo.
at com.peoplesoft.pt.integrationgateway.framework.IBRequest.setFromPS_XML(IBRequest.java:155)
at com.peoplesoft.pt.integrationgateway.framework.IBRequest.(IBRequest.java:127)
at com.peoplesoft.pt.integrationgateway.listeningconnector.http.HttpListeningConnectorUtility.initializeISRequest(HttpListeningConnectorUtility.java:614)
at com.peoplesoft.pt.integrationgateway.listeningconnector.http.HttpListeningConnectorUtility.createIBRequest(HttpListeningConnectorUtility.java:664)
at com.peoplesoft.pt.integrationgateway.listeningconnector.HttpListeningConnector.service(HttpListeningConnector.java:357)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
..
..

Changes

Cause

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