After upgrading firmware to 18.104.22.168-q50 and QuickVPN 1.1 clients can not connect while the router firewall is enabled. I have uploaded 22.214.171.124-q50 and .10-q50 after resetting to factory defaults, I have downloaded both multiple times to enure no corruption of the firmware. The router operates fine in every other aspect. I have tried all combinations of enable/disable for the firewall options (spi, DoS, WAN block), the only solution is to diable the master firewall option. The above firmwares are the only available to me with the 50 quick vpn clients. I have also attempted to set access rules allowing ALL traffic in but this does not work either. Linksys support was so gracius as to tell me to use the latest firmware and QuickVPN client after I had stated such details in my support request. They offered no other guidance or suggestons! :argue: Any insite into this issue is appreciated, due to the nature of the office I would really like to use the built in firewall.