For the last 2 days, pubsubhubbub.appspot.com has stopped responding to new subscriptions. I send the subscriptions request, the request returns ok (I use async callback), but I never get the callback request.
My application has not been updated for a few weeks, and the last successful subscription for me was on 2010-09-21T20:52:00 UTC. Since then, it just stpped responding to my subscription requests. Note that I still receive updates on the subscriptions that I successfully registered before this date. Is there a known problem with the hub? Is there a limit to how many subscriptions I can hold? (I have a couple of hundred right now, although combined they result in no more than a handful of updates per day). Even if I hit some limit, shouldn't I get some error message? Thanks and regards, Elias
