The manual suggests that I should gnus-group-browse-foreign-server to look at atom feeds. However, when I do this, I receive the message "couldn't request list: nil", without fail. I have tried this on multiple feeds, so it's not just one feed, it's across the board.
I've tried digging into the sources to figure out why this could be, but I'm not quite familiar enough with the backend internals to work it out.