If you run the selenium server with these arguments java -jar selenium-server.jar -interactive -forcedBrowserMode *iexplore -singlewindow -debug and then try to login to a web site that uses session cookies for authentication, you'll be bounced back to the login page because selenium is not handling cookies correctly in the browser. To Reproduce this Bug: 1. Start the Selenium server with these arguments: -interactive -forcedBrowserMode *iexplore -singlewindow -debug 2. Copy the EmbeddedIESeleniumBug.exe and the ThoughtWorks.Selenium.Core.dll files to the same directory 3. Run the .exe 4. Notice how after Selenium submits the user information, the browser is bounced back to the login screen.