Have you banned Y! Pipes machines from fetching the news.y.c rss? (almost?) all Yahoo! pipes fetching the feed http://news.ycombinator.com/rss are failing and showing this error on the debug console'
error fetching http://news.ycombinator.com/rss (502 Bad Gateway)
'
example -
http://pipes.yahoo.com/pipes/pipe.info?_id=KCPCxw8t3RGoQM1MLe2fWQ