He is using PASV mode, and I am using a NAT based connection.   
 
There seems to be some box you can tick in Flash (Router/NAT etc) that allows ppl to connect to my site.  However, with other clients, it doesn't work. 
 
I have since put my IP in the DMZ on my router and this seems to have solved the problem temporarily...
		 
		
		
		
		
		
		
		
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