There is one configuration that will NEVER work.  If both the server and the client are behind a firewall or nat, browsing is impossible without a proxy.  One of you has to be outside.  If you are outside, non-passive mode will work..if the server is outside, but you are behind a firewall or nat, you must use passive mode. 
 
have you tried other ftp sites..like public ones?
		 
		
		
		
		
		
		
		
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