mod_cluster 503s request when JBoss is shutdown instead of doing failover

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Issue

I am getting a Service Unavailable page and a 503 response from Apache/mod_cluster when a JBoss node restarts. Isn't mod cluster supposed to detect that Jboss is down and re-send that request to another node?

Environment

JBoss Enterprise Application Platform (EAP) 6
mod_cluster
JBoss Enterprise Web Server (EWS)
Apache httpd

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