Client disconnects

If I leave a JS client (JSJaC 1.3) idle for roughly 2 minutes it loses its connection to Openfire.

Has anyone else experienced this behaviour?

Any idea of why?

i have such system property set for a long time

xmpp.client.idle -1

though i’m not sure do i really need it, but Exodus and Spark are working fine. In the last live chat there were some talks about that property.