Over the last year there has been a substantial increase in the number of sites on the internet generally (all over the world) that have been hacked due to viruses that steal FTP credentials from user's home computers.
The hackers then use these credentials to insert hidden code within your website.

Please see http://en.wikipedia.org/wiki/Gumblar for more information on this type of attack/virus.

To reduce the significant threat from these viruses Green ISP / Green WebHost has been working with a focus group of customers to come up with a solution that protects websites.
One solution is to lock FTP when it's not in use, making it extremely difficult for the hackers to infect your site via this route.

What do you need to do:
To unlock FTP, our customers will simply log into their Green WebHost control panel at:
http://cp.greenwebhost.net
and click one button to unlock FTP for a period of time.
FTP will then automatically lock again after the time period has expired.

Customers will also be able to nominate an IP address that has permanent FTP access (foe example, any Static IP address of their ISP,s Internet/Broadband connection, customers FTPing from that IP address will not have to unlock FTP.
If you nominate an IP address (as above) nor will you have to unlock FTP if you use the File Manager within the Green WebHost control panel.

These security measures will ensure that the majority of sites have FTP locked, greatly reducing the risk of having your websites infected.

I hope this explains? and hope that there is not too much inconvenience caused by this essential security measure.

We are introducing this in the interest of customer security.

Thanks in advance for you're understanding and patience regarding this matter.

Regards.

Green ISP / Green WebHost Customer services.