TheCannot Resolve Host Name message is displayed when CuteFTP cannot make a connection to the FTP Host Address that you specified when you set up the connection. It could be compared to browsing to a Web site that either is not up at the moment, or does not exist. There are several ways to approach this situation:
Make sure you are connected to the Internet. If you are not connected to the Internet, you will need to connect before you can connect to any FTP sites.
Make sure you typed in the FTP Host Address correctly. This would be just the host address of the server. For example, if you were given an FTP Host Address in the format: ftp://ftp.yourhost.com, you would only type in ftp.yourhost.com. Also be sure there is nothing after the host address, especially slashes ("/") indicating subdirectories. If the server does not automatically put you in your default directory when you log in to it, then you can add the directory into the "Default Remote Directory" box when configuring this site.
If you have a firewall or proxy server, make sure CuteFTP is properly configured to work with the proxy server. You can edit the firewall or proxy settings by clicking Tools > Global Options and expanding Connection and selecting Proxy Server. If you are not sure what the settings for the proxy should be, you will need to contact your network or system administrator for that information.
If all of these options fail and you still have the same results, you will need to contact the server administrator of the site you are connecting to in order to resolve the problem.