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in fact you have access to some kind of FTP server and you ask it to get data from a specified Target ip address and port if it returns with a 425 code or similar you do know that the specified port is unavailable at the Target and disguising your originating ip address in regard to the target — Preceding unsigned comment added by 87.189.71.51 ( talk) 11:10, 21 August 2012 (UTC) reply