I have Kubuntu 8.04 and KDE4.1

When I connect first time to a remote computer (in my local network) by fish (using Krusader 1.90/KDE3) everything is ok.
However, when I leave this connection alone for some time, it breaks (supposedly on timeout), but neither Krusader, nor Dolphin, nor Konqueror cannot restore it.

They write "Connecting..." and just sit and wait for something.
At that time, I can successfully connect to that computer from a command line with ssh

I tried killing kio_fish process and deleting the file ~/.fishsrv.pl on the remote computer nothing helps/

Complete reboot saves. But this is wrong and annoyting to reboot every time.