I've just stumbled on this issue; while trying to check whether this was already reported upstream I found that sleekxmpp has been deprecated in favour of its fork slixmpp
https://groups.google.com/forum/#!topic/sleekxmpp-discussion/FTBMUMMvfLk In my case the solution was to convert my program to use the latter, which is able to connect to a modern ejabberd with no issues. -- Elena ``of Valhalla''
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