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Nodes not accepting requests even though they are on

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Hi all,

I have a scenario where a cluster in weblogic has 4 nodes and all nodes are up. But looks like 3 nodes are not accepting requests for some reason. There is also a apache front end to take care of load balancing.
Any ideas why that might be?

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is Apache configured with wls_mod plugin to become a load balancer among that cluster ?

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I'm guessing you could first start looking at log files.  

WebLogic managed servers, which I assume you are referring to as nodes, writes to a log every time it receives traffic.  I'm assuming you're sending HTTP traffic to the managed servers?    

Its' also possible to enable logging on the Apache server if you are using the wls_mod plugin, don't recall the syntax but I have used these logs before when doing failover testing.  

WebLogic HTTP access logs

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