Originally Posted by kranu
I thought that the Kindle turned of WiFi (and thus connection to SSH) when it went into stand-by mode...
Wifi stays on if the kindle is receiving power over the USB port (not in USB Drive mode). Either the kindle must be in USBnet mode, or the USB Drive must be ejected, or the USB port must be connected to a power adapter.
UPDATE: Although this was true for the older kindles, it seems that wifi is disabled when the new K4NT and Touch go to stand-by mode.