didnt find it, make sure if theres a router present you are port forwarding. Also, if you set it up as anonymous access there is no need to specify a username and password. With IE and Opera, anonymous access is always attempted first unless the user issues a user and pass in the address. And in all ftp client programs you have "Normal, anonymous, and registered" (or to that affect).
If you dont want anyone to be able to access it, create a user/pass and turn off anonymous access.