port forwarding

i got a router WAN ip 202.160.7.3, LAN ip 192.168.1.254.
I have set port forwarding 80 and 21 to my internal server ip 192.168.1.1 with web exchange and ftp. my internal workstation, on the web- 192.168.1.1/exchange…theres a pop out menu to login..and ftp://192.168.1.1, is running, but when i key in ftp://202.160.7.3 or 202.160.7.3/exchange, is not running, please help me….or is there any other configuration??