WPMU Dashboard In Will Not Download PlugIns

At first Pressing the install button gave a return of Error directly below the plugIn I am Downloading. This happens with anyone I choose. So I removed the plugin then reinstalled the WPMU Dashboard and now it gives a return (on a new page) of " An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. "

Any ideas?
Thanks for your time
Michael