Berkeley CSUA MOTD:Entry 10166
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2003/9/12 [Academia/Berkeley/Ocf, Computer/SW/Unix] UID:10166 Activity:nil
9/12    I can't FTP into OCF from behind firewall/router.  Can anyone tell
        me what's wrong? -stupid newb
        \_ block ephemeral port and doesnt understand ftp PORT cmd? --psb
        \_ use FTP in passive mode.   ftp -p
        \_ As the above says, use passive mode.  Ftp's normal mode is to
           have the server try to connect back to the client so the client
           becomes a server of sorts.  This attempted connection smacks into
           your firewall and thus ftp in it's normal mode fails.  Passive
           mode doesn't do that so you can ftp from behind firewalls.