Not able to open jenkins console after version upgrade

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      After jenkins upgrade not able open console. Facing below error in status:

       

        INFO        hudson.util.Retrier#start: Attempted the action check updates server for 1 time(s) with no success
              SEVERE        hudson.PluginManager#doCheckUpdatesServer: Error checking update sites for 1 attempt(s). Last exception was: IOException:  Unable to tunnel through proxy. Proxy returns "HTTP/1.1 404 Not Found"
             INFO        hudson.model.AsyncPeriodicWork#lambda$doRun$1: Finished Download metadata. 528 ms

            Assignee:
            Victor Martinez
            Reporter:
            Achyuth Garnapudi
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: