Solution 1
You are using an old version of Namu6, please download the latest version.
This was a common problem in versions 2.2 and under.
Solution 2
Your computer may not be connected to the internet.
Check that your computer is connected to the internet. Always connect to the internet before publishing your website.
Solution 3
The FTP host address may be spelt incorrectly.
Check that the "FTP host address" field in Namu6 matches the address your host provider gave you.
Make sure the FTP host address does not contain "ftp://", spaces, commas or slashes.
Solution 4
Windows Firewall or another firewall such as ZoneAlarm or McAfee Personal Firewall may be blocking Namu6.
Configure your firewall to allow Namu6 to connect to the internet.