Hi,
Have you configured health-check url? This is most common mistake people make.
Please refer to document available at
http://docs.sun.com/app/docs/doc/819-3679/abdhx?l=en&a=view.
In case you have already done that, please post your load-balancer xml, so that
we can help debug your issue.
Health-check is always done for unhealthy instances. This behavior is fixed and
not dependent on any configuration. However you can have active health check to
figure out whether instances which are marked healthy are actually healthy or
not. By this proactive way, you can avoid failures when requests are being sent
to instance which is done. However it has some cost associated with it.
Hope this helps,
Kshitiz
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