ruby - 尝试从 FTP 下载文件导致 "500 Illegal PORT command"错误

Question

如果我在本地执行，一切正常:

require 'net/ftp'

ftp=Net::FTP.new("myftpserver.com", "username", "password")

ftp.getbinaryfile("/myfile.zip","localfile.zip")
ftp.close

如果我尝试在我使用的 Linux 服务器上执行它，结果是:

/usr/local/lib/ruby/1.9.1/net/ftp.rb:273:in `getresp': 500 Illegal
PORT command. (Net::FTPPermError)   from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:281:in `voidresp'  from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:304:in `block in voidcmd'  from
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'   from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:302:in `voidcmd'   from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:317:in `sendport'  from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:325:in `makeport'  from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:358:in `transfercmd'   from
/usr/local/lib/ruby/1.9.1/net/ftp.rb:420:in `block (2 levels) in
retrbinary'   from /usr/local/lib/ruby/1.9.1/net/ftp.rb:166:in
`with_binary'   from /usr/local/lib/ruby/1.9.1/net/ftp.rb:419:in `block
in retrbinary'  from /usr/local/lib/ruby/1.9.1/monitor.rb:201:in
`mon_synchronize'   from /usr/local/lib/ruby/1.9.1/net/ftp.rb:418:in
`retrbinary'  from /usr/local/lib/ruby/1.9.1/net/ftp.rb:539:in
`getbinaryfile'

可能是什么问题？

Answer 1

我在 http://www.ruby-forum.com/topic/161274 找到了答案:

Beyond firewalls, active ftp won't work behind a NAT device. Ftp servers sometimes say illegal port command if you tell them that your address is a private ip address like 192.168.x (your address on the network behind the nat device)

添加:

ftp.passive = true

修复它。