Kindle 3 problem when connecting via ssh (gets ip but no ping)?

Question

Amazon Kindle

I connect kindle via shh . The router gives the ip address to the Kindle, but there is no ping, when trying to connect via putty / WinSCP it gives an error Network error: permission denaed, while the Kindle quietly goes to the Internet. All other devices with wifi also receive ip and at the same time respond normally. Maybe someone faced a similar problem.
OS win7, router dlink dir615 (dd-wrt), kindle 3 (jailbreak + usbnet hack)