I have the same TV and am getting the same error. It seems most Canadians are having the same problem, based on the forums I have read. Anyone going to respond to this issue?
I keep getting Connection Error 606 when trying to update my LN46B750 firmware over the network. I know my TV has a working internet connection because the widgets work fine. The reason I am trying to update over network is the support page for this TV only has firmware 1012.3 available for download, but I know there has since been a 1013 and 1016 firmware available over the network. I have read many user reports of the same connection error from other B750 owners and nobody knows why. Samsung could you please look into this, or at the very least post the most up to date firmware for this TV on your site?