The quick and dirty version is this: normally, when you send a file using FTP, your FTP client opens a connection to the server and when the file is about to actually be sent, the server opens a NEW connection to your FTP client. Firewalls can block this server originated connection which will prevent FTP from working as designed. "PASV" is command to configure a "passive" FTP connection with the FTP server. In "passive" mode, the FTP client opens all connections to the FTP server and firewalls won't block that since all of the connections originate on the same machine.Thanks very much for your answer - I will follow up with site manager. Out of interest, can you tell me what PASV ftp is and why a site manager might not support it ? Also, can you recommend an easy for idiot to use standalone ftp client pls ?
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