Query on Red Hat JBoss Application Administration I (Dublin) class(JB248)

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Issue

We're using the virtual Station 23 for the Jboss class (course JB248-en_US-1.0-6 ). The postgres authentication is failing with below error :

fatal ident authentication failed for user postgres

What could be the cause of the issue?

Environment

RedHat JBoss Enterprise Application Platform (EAP)
JB248-en_US-1.0-6(Station 23)

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