Update
Loading a small history archive up to usegalaxy.eu worked for me today (as did loading from a URL). It did take some time to populate and show up in a refreshed User > History listing. The test for usegalaxy.org is still running.
So, the basic functionality is intact. It may just be that connections are more easily interrupted when larger archive transfers are attempted from slower connections or I happened to hit a time when the server itself was not as busy.