ISA Server - Cant connect to FTP, but port is open and serve

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I am using ISA server and I have all the stuff (I think) that i need setup in the ISA Managment. ANd the port is open when I scan it from anywhere.

 

I'm using ServU FTP Server, and it is running and from what I can see should be working.

 

Why cant anyone connnect including me?

 

I just get a connection, then it fails. I dont understand I have gone though everything I can think of.