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What is reported in the Managed Server log? Also check the Managed Server .out file.
Thanks for your reply.
There is no exception found in Managed Server log and the Managed Server .out file. Thats why i taken the log trace from the Admin server log.
Ananda Krishnan S
Sorry Ananda then I don't really know. I would think your Managed Server has basically died. I would restart it and check what is happening in the log files. Presumably it will happen again.
One possibility is that your server is not able to send heart beat messages to cluster members and got out of cluster. At such situations as Admin server is not able to communicate to managed server it changes it's state as UNKNOWN in Admin console , however it could happen your server health is green and it is also handling requests.
If such is your situation then server restart is the only option to again connect Admin server to managed server and display actual state in console.