He runs his own authoring system, OPML Editor (a derivative of Userland Radio / Userland Frontier). That listens on port 5337. So that's fetching something loca

He runs his own authoring system, OPML Editor (a derivative of Userland Radio / Userland Frontier). That listens on port 5337. So that's fetching something local, except it will only work on his box, possibly anyone else running OPML Editor on theirs too if there's some common shared code running in that environment.