Good you got it solved. I once ran into the same problem with my last ISP, never got ot to work. Then with my next ISP I was allowed to connect to myself. Odd. Keep the addy for testing your ftp in the future - you get a reliable respons in minutes - much easier than going online and ask friends to test it.
And an addon to the last post by HotRod; there are several thousands of more unassigned ports. Just google for them or try this list here:
_http://www.iana.org/assignments/port-numbers
I don't think you'll ever need as many as 80 ports, and your server probably doesn't support that many either. It should be enough finding an area of say 50 ports and you should be safe.
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unicorn
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