ftp server over internet

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Linux

FTP

I want to make my ftp server over the internet

i made it on Debian linux computer

and i changed the port of it to 201

my local ip is 192.168.1.3

so i can access it from any computer on my network through ftp://mylocalip:201

it appear to me the login page i login with my linux user and can see the files on my ftp server

to make it public i make port mapping on my router for port 201

when i try ftp://mypublicip:201 it give me the login page and when i entered the login data it is loading infinity without open my ftp server files

when i made it over default port 21 it works fine.

can any one tell me what is the problem here?