We are using weblogic 10.3.5.0. I had problems because the managed server suddenly went to unknown state while running and the below trace is taken from the Adminserver log. Please help me to find the root cause for this issue.
####<Feb 23, 2013 10:47:45 AM IST> <Info> <Server> <chnlxnet09> <AdminServer> <[ACTIVE] ExecuteThread: '11' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <e843b504d952350a:1fcd1e01:13d03a9540f:-7ffd-00000000000007e6> <1361596665831> <BEA-002634> <The server "psMS7" disconnected from this server.>
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.