See the meaning here (a) Meanings of the download messages. / (b) http://www.gnutellaforums.com/gettin...-limewire.html (has better explanations, details & some tips)

It means that they have probably gone offline. Best answer is to re-search the topic to see if you can find fresh sources (hosts). But also beware of fake files: * Recognising Fake files, * Avoiding fake files, * More tips of fake files