I've configured my Router but I'm not able to get FTP working. I've NAT setup to IP address of FTP Server for port 20 & 21. Do I need to do more to get FTP working on Router?

Hi, I have a Cisco 877 Router but it drops VPN connections to my ISA Server. I have NAT Rule pointing traffic on Port 1723 to the IP address of ISA Server. The ISA sees the connections but it timesout on authentication. I've reverteed back to using C...