This might also be a problem with error logging. It looks like it's trying to log the error but it cannot from some reason.
$ bundle exec bin/aeolus provider_account list
E, [2013-01-23T10:58:54.841618 #10601] ERROR -- : Could not log "request.active_resource" event. NoMethodError: undefined method `code' for nil:NilClass
Error: Connection refused - connect(2)
For further debugging information, see /tmp/aeolus-cli-trace-10601.log