Selenium WebDriver on IE11 always has "--port=" in URL
It seems that you are using your native Windows IE? You have to download the IE WebDriver from https://code.google.com/p/selenium/wiki/InternetExplorerDriver and your webdriver.ie.driver
property needs the path to the downloaded IEDriverServer.exe
Please try and report if that solves your problem. If not I will change my chrome WebDriver to the IE and try it myself :)