Resolution:

Enable FIPS 140-2 by adding the following property to the gsengine.tra file:

java.property.com.tibco.security.FIPS=true

If the property is not enabled (default), you will see the following message on startup:

===========

[2016-05-11 13:28:39,375(INFO )]GatewayServer Initializing secure token...

[2016-05-11 13:28:39,547(INFO )]Initializing Entrust crypto provider in NON FIPS 140-2 mode; insert provider as normal

===========

If the property is enabled, you will see the following message on startup:

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[2016-05-11 13:30:00,967(INFO )]GatewayServer Initializing secure token...

[2016-05-11 13:30:01,149(INFO )]Initializing Entrust crypto provider in FIPS 140-2 mode; insert provider as normal

===========