I think I can gather that you do not live with your friend, and you live on another premise. Does his server work in the slightest? Or is it just a problem at your end?
Assuming he cannot get the server to work on the Internet as a whole... You need to check whether he has mapped the relevant FTP port in ICS. E.g. if his server was running on port 21, then he would need to set-up ICS to map port 21 to his computer. Otherwise, the gateway (computer with the Internet connection) will receive the FTP connection attempt (which would be ignored).
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