Jenkins can't reach update json despite browser load it correctly

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      Brand new Jenkins instance is behind corporate proxy. Test URL passed, but checking plugins ends in "There were errors checking the update sites: FileNotFoundException: http://updates.jenkins.io/update-center.json?id=default&version=2.176.3", see screenshots.

      This URL is normally available in browser. When "Use browser for metadata download" ticked, I'm able to browse plugins but I can't download anything. I tried update mirrors (mirror.serverion.com) as update URL but still nothing. 

        1. error_log.txt
          9 kB
        2. jenkins_center_browser.PNG
          jenkins_center_browser.PNG
          39 kB
        3. jenkins_issue.PNG
          jenkins_issue.PNG
          45 kB

            Assignee:
            Unassigned
            Reporter:
            Bartlomiej Chrabaszcz
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: