How to identify if any network issue caused Weblogic server instance(s) to stuck or go down

Hi Expert,

Need your help to understand, How to identify if any network issue (e.g., change in network switches) caused Weblogic server instances (in cluster) to stuck or go down.
What should be the investigation procedure, any particular log file to look into.

Pls Suggest
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Yes, AdminServer.log is first place to start. Unless you find ANY log line saying something went down (can be monitoring system outside weblogics') you cannot even call oracle support with "problem" that has no material trail.

Please produce few lines from AdminServer.log around whatvever "stuck go down" event happened.
SANJAY HALDARAuthor Commented:
Thanks gheist for your input, we will look in the AdminServer.log and look for any potential input. Will revert back.
You need to have node manager to restart managed servers even on same machine.

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