FTP servers use port 21 by default for clients to connect. You are client and connecting to a ftp server. If you get this error then anything may be possible:
1. problem is on other side, the ftp server is down
2. ftp server requires authentication (username and password)
3. ftp server is not using default port 21
4. local problem: your firewall is blocking access to FTP
To see if problem is 1,2, or 3. Type ftp://ftp.arsc.edu
in your browser (This is ftp server of Arctic Region Supercomputing Center and it lets connect anonymously at port 21.) If you see folders, then you just connected to ftp server of ARSC.
If your browser is blocked to access FTP by firewall etc then do this:
Disable firewall for a momen if possible, [later enable it].
Open Start Menu>Run
and type cmd
. In the command-prompt
type following:ftp ftp.arsc.edu
and press Enter
If you see a welcome message from the ftp server, then you can connect. In that case type quit
to disconnect from the server. Dont forget to enable firewall.
I recommend using a FTP client to access FTP servers like :http://filezilla-project.org/http://www.smartftp.com/