Weblogic Managed Server Does Not Start with error "The server oacore_server is in an incompatible state"

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 Solution:

Check that the instance is not running using ps –ef oacore_server2 If it is, use kill -9 <pid> to stop the running instance.

Remove the state file:

If the managed server name is “oacore_server2”, then go to the managed server machine, delete the following:

cd $DOMAIN_HOME/servers/<Server-Name>/data/nodemanage/<Server-Name>.state

<Server-Name>.state is the node manager file containing instance information and status.

After deleting this file, the managed server can be remotely started from the Admin Console

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