Bad repository - suddenly appearing on my servers

I'm suddenly getting a string of messages on the server plugins page:

Bad repository http://www.mysqueezebox.com/public/plugins/logitech.xml - Timed out waiting for data
Bad repository http://www.mysqueezebox.com/public/plugins/other.xml - Timed out waiting for data
Bad repository http://www.mysqueezebox.com/public/p...repository.xml - Timed out waiting for data


Ideas?