There are a few ways to connect by FTP to a host. The easiest way is using Internet Explorer which has the best ftp support.
In order to connect by FTP with your browser, you should just use the following address:
ftp://YourFtpUser:YourFtpUserPassword@yourdomain.com
However, if your FTP user to connect is similar to user@yourdomain.com then you will have to URL encode it like this:
ftp://YourFtpUser%40YourDomain.com:YourFtpUserPassword@yourdomain.com
In the above case it is important to note what the FTP username is:
YourFtpUser%40YourDomain.com
This address is URL-encoded and comes from YourFtpUser@YourDomain.com where @ has been substituted with %40, which is the ASCII code for @.
If you still have problems connecting by FTP, it is possible that your outgoing TCP port 21 is blocked by your local firewall or Internet service provider. If this is not the case, then your FTP server might be unreliable and you should transfer to a stable FTP service provider.