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Once token generated in keystone, when any request goes to swift in proxy has to validate the token. There are few possible scenarios

  1. keystone is unavailable or not able to reach such keystone services then middle ware could throw this error.
  2. Even keystone is running but if the token storing mode is kvs then after token generation if keystone service restarted then token would have been lost. So using same token to swift might hit this error.