If it works for you, but not the OP, I suspect DNS problems are to blame. Try this:
- Open System Preferences
- Open the Network pane
- Click the Advanced button
- In the window that appears, click the TCP/IP tab
- Examine the contents of the box that says DNS Servers.
If there is anything in there, try copying and pasting the contents to a text file, then clearing the box and clicking Apply. Try your request again. Does it work now?