title: Selenium abotring with "UnreachableBrowserException/Address already in use" occurring on one computer
body: <p>I have a java webdriver driven selenium execution which does a loop over a list to enter different infomation into a textbox and sending it using the FirefoxDriver.</p>
  
  <p>On one computer, quite reproducible, after the 10th or 11th iteration, the call of  <code>findElement(By.id("mi4"))</code> raises an <code>UnreachableBrowserException</code>.</p>
  
  <pre><code>Jun 29, 2012 1:52:02 PM org.apache.http.impl.client.DefaultRequestDirector tryConnect
  Information: I/O exception (java.net.BindException) caught when connecting to the target host: Address already in use: connect
  Jun 29, 2012 1:52:02 PM org.apache.http.impl.client.DefaultRequestDirector tryConnect
  Information: Retrying connect
  Jun 29, 2012 1:52:02 PM org.apache.http.impl.client.DefaultRequestDirector tryConnect
  Information: I/O exception (java.net.BindException) caught when connecting to the target host: Address already in use: connect
  ...
  Exception in thread "main" org.openqa.selenium.remote.UnreachableBrowserException: Error communicating with the remote browser. It may have died.
  Build info: version: '2.24.1', revision: '17205', time: '2012-06-19 15:28:49'
  System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.7.0_04'
  Driver info: driver.version: RemoteWebDriver
     at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:467)
     at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:242)
  Caused by: java.net.BindException: Address already in use: connect
     at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
     at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
     at org.openqa.selenium.remote.HttpCommandExecutor.fallBackExecute(HttpCommandExecutor.java:337)
     at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:297)
     at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.execute(NewProfileExtensionConnection.java:136)
  </code></pre>
  
  <p>There is no third party program listening on any ports. However, I use two instances of FirefoxDriver, meaning two Firefox instances/Windows opened in parallel, which works without any problem on a Win7 machine, the problem described occurs on a Windows XP machine.</p>
  
  <p>I use Firefox 13 with selenium 2.24.1.</p>