Can't Connect to Openfire Server

I had been successfully using, over a period of months, the (public) openfire server to test out my Actionscript 3 client which uses XIFF. I didn’t use it at all during the summer and when I tried it out two weeks ago I couldn’t connect. Has anything changed on this server that would explain this? (My first thought was that my account had been removed but this is not the case and I can connect using spark.) An upgrade to Openfire that is somehow incompatible with the version of xiff that I am using?