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and what is the question now?
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 &nbsp;I mean how to access this perticular ftp sites from network computer ?
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 I mean how to access this perticular ftp sites from network computer ?

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&nbsp; &nbsp;My office ftp server is on window machine and is accessible with some range of publice IP(x.x.x.x/21).But one of these publice IP is connected with Linux &nbsp;machine which has nating and proxy server running.Now the computers on this lan could not open this ftp site but no problems with internet.
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   My office ftp server is on window machine and is accessible with some range of publice IP(x.x.x.x/21).But one of these publice IP is connected with Linux  machine which has nating and proxy server running.Now the computers on this lan could not open this ftp site but no problems with internet.

want to open ftp port

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.