While passive mode FTP solves many of the problems from the client side, it opens up a whole range of problems on the server side.

被动模式的FTP解决了客户端的许多问题，但同时给服务器端带来了更多的问题。

youdao

It also analyzes some problems in FTP data connection with Passive mode and Port mode.

此外，还分析了FTP数据连接的主动模式和被动模式所遇到的安全问题。

youdao