we are operating Openfire 4.1.3 on a Ubuntu 14.04 VM. Clients all using Spark to connect. All is based within an IPSEC Network. All Tunnels are working. From time to time clients are disconnecting and disappear from the roster. I already chose the option "do not diconnect clients that are idle". When I restart the openfire service manually, all disconnected users are available again. Sometimes Spark crashes while restarting the service but thats another problem.
Here are some logs, maybe it can help understanding the problem:
java.io.IOException: Die Wartezeit für die Verbindung ist abgelaufen
Thanks for your help in advance...