Using a NAT Firewall

When using a NAT (Network Address Translation) firewall, you may encounter problems when trying to use SSL encryption. To fix this, you should configure WS_FTP and the firewall to allow incoming connections to your PC. WS_FTP needs to tell the server to connect to the external IP address, and the firewall should forward these incoming connections to your PC. You should also limit the number of ports that the firewall opens for these connections. In many cases, this will allow you to use SSL through a NAT firewall.

Note: If you are using Windows XP, you may be able to automatically configure your firewall to open the necessary ports and obtain the external IP address using UPnP. UPnP can be enabled on the Program Options: Firewall dialog.