Category feed for feedburner

I have recently taken over hosting duties of a website and the previous owner doesn’t want to deal with transferring his feedburner feed. He had it set up to feed only the podcast category so that a sidebar widget could be used to have links to all of the existing podcasts. After reading though posts here and on feedburner’s forums it seems like all you should have to do is burn the feed’s url as /category/podcast/feed. When I try this I only get a server time out. Is there something that I’m missing somewhere? The site is http://www.nerdcityonline.com and I already have a feed set up to cover all posts (.com/feed).
Thanks!!