after few seconds (less than a minute) a port forwarding connection has been started (and working) the following it disconnects without reason.
I use poderosa Version : 4.3.8b, CLR : 2.0.50727.4223. On windows Vista 32bit. The connection passed through a ipSEC tunnel. The same connection works with putty port forwarding without any problem.
Attached screenshot and port forwarding log