Reconnect thin clients how?

Question

LTSP

I hope the final question on this topic.
ltsp on ubuntu server. I did not find this issue in the manuals. When disconnecting from the server, the client hangs stupidly and except for how to restart the handles when the connection is restored, nothing can be done. The question is how to force them to reconnect themselves so that there is access at least via vnts or sssh?