Selenium::WebDriver::Error (unable to obtain stable firefox connection in 60 secs (127.0.0.1:7055)): does not work on production

Firefox V:38.0 and V:39.0 Selenium 2.46.2. In Site rb Works fine on local but not on production.

browser = Watir::Browser.new :firefox # should open a new Firefox browser.goto self.url browser.driver.manage.timeouts.page_load = 60