orignal router(modem?)---second router(wireless router?)---PA511====== PA511---PC(error code 651?) Is my above understanding right? On your PC, there is broadband connection? Because as I know error...

What's the operating system of your laptop? Are there any other wireless clients for you to test? Channel width is 40MHz? Network is secured with encyption AES? Can you post some screenshots of your...

Are you trying to access ftp client locally or remotely? After add the router in your network, did you change settings on ftp client? For example, host's IP? You'd post some screenshots here.

Why do you access it 6 times in a row? Is it necessary? :confused:

Plug the 3G to your PC directly. If it works fine, maybe it is your router issue.

Which port did you open? D7 is working as a router or modem router? WAN IP address is a public one, right? Outside the network, maybe anti-virus software or windows firewall blocks it?