Can't access our FTP site using IE7

I have just setup a test FTP Server on one of our servers and I have also published an FTP Server rule on our ISA 2006 Server, the FTP site works fine internally, but from outside the ISA 2006 server I am unable to access the FTP site using IE7 and just get an error message saying that  Internet Explorer cannot display the webpage, the URL I am using is ftp://public IP of ISA Server.

What can be stopping this from working and how do I correct it.
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Steveh24Author Commented:
I have already tried this, but it makes no difference, although I will say that I have to use the public IP address instead of the domain name as the our current FTP 'A' Record is pointing to our hosters server.
Steveh24Author Commented:
Having read several articles on using IE7 for FTP, it would appear that it is not the best tool to use and have started to use an FTP Client, which has solved the problem of accessing our FTP Site.

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