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Application in clustered domain goes down even if it is load balanced

 
Greenhorn
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Hello,

I have two managed servers ms-1 and ms-2 added to a cluster in a weblogic server(12c) and a load balancer (Baracuda) used to manage traffic to these servers. My Application is deployed to this cluster and can be accessed via the URL of load balancer. While monitoring requests the being served in these managed servers I can see it is distributed and serving fine to users. But, if I shutdown one of the managed servers, ms-1 of ms-2, my application goes down and page shows network error. However, it will go to login page if I refresh or reload the page and I could see that the request at that time was redirected to the managed server which is currently in running state.
How can I manage this failure? I don't want to show the users that the connection to the server has failed. Instead, I want the active sessions in ms-1 to be transferred to ms-2 automatically, if ms-1 is down without user knowledge.  At least, I need to bounce back to the login screen without showing the connection failure to the user ?

Details:
ms-1 and ms-2 has unique port numbers
Cluster has a port number
Unicast protocol
Round robin algorithm

Am I missing any configuration? Kindly let me know how I should proceed.
Any help is highly appreciated.
 
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