ktorrent 2.2.7, KDE 3.5.10

I can't download any torrent from RSS with following error in modal window: "Failed to find and download a valid torrent for NNN". Log (with full log level) is empty. No other uploads/downloads in background. Download using RSS filters does not work too. But when I try to view the same RSS feed in my Firefox browser and download the same torrent by link using the same ktorrent client, it works.

What's wrong with RSS module?