Error message "javax.naming.CommunicationException: WFHTTP000005: Invalid response code 400" seen on EJB connection

Issue

• An EJB Application is split into two different Red Hat OpenShift Container Platform (RHOCP) clusters.
• The communication is working over an EJB connection.
• The communication is running fine in Red Hat JBoss Enterprise Application Platform (JBoss EAP) 7.3.
• After migrating both EJB client and the EJB to RHOCP 4 and to JBoss EAP 7.4 the communication is no longer working.

• The following errors are seen in the logs:

  • EJB client side:

    "Caused by: javax.naming.CommunicationException: WFHTTP000005: Invalid response code 400"
    

  • EJB side:

    "Authentication failed with message ELY05169: [DIGEST] Clients response token does not match expected token and mechanism DIGEST for HttpServerExchange"