IOException: java.net.ConnectException: Connection timed out: connect

URL yahooURL = new URL("http://www.yahoo.com");
URLConnection yahooConnection = yahoo.openConnection();

I am under companies' firewall. But if chnage URL to an internal webpage, this code works.
Do you know why?

I try to open connection like above. I got following error:
IOException: java.net.ConnectException: Connection timed out: connect
java.net.ConnectException: Connection timed out: connect
      at java.net.PlainSocketImpl.socketConnect(Native Method)
      at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
      at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
      at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
      at java.net.Socket.connect(Socket.java:464)
      at java.net.Socket.connect(Socket.java:414)
      at sun.net.NetworkClient.doConnect(NetworkClient.java:139)
      at sun.net.www.http.HttpClient.openServer(HttpClient.java:402)
      at sun.net.www.http.HttpClient.openServer(HttpClient.java:618)
      at sun.net.www.http.HttpClient.<init>(HttpClient.java:306)
      at sun.net.www.http.HttpClient.<init>(HttpClient.java:267)
      at sun.net.www.http.HttpClient.New(HttpClient.java:339)
      at sun.net.www.http.HttpClient.New(HttpClient.java:320)
      at sun.net.www.http.HttpClient.New(HttpClient.java:315)
      at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:522)
      at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:499)
      at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:620)
      at com.nokia.ipm.test.AutomaticTest.main(AutomaticTest.java:36)

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