尝试在我的 google 计算引擎实例上设置 vsftpd 后，我无法完全连接到 FTP 服务器。尝试使用 FileZilla 登录后，我收到了以下回复：
Status: Connecting to ***.***.***.***:21...
Status: Connection established, waiting for welcome message...
Response: 220 (vsFTPd 2.3.5)
Command: USER anonymous
Response: 331 Please specify the password.
Command: PASS **************
Response: 230 Login successful.
Command: SYST
Response: 215 UNIX Type: L8
Command: FEAT
Response: 211-Features:
Response: EPRT
Response: EPSV
Response: MDTM
Response: PASV
Response: REST STREAM
Response: SIZE
Response: TVFS
Response: UTF8
Response: 211 End
Command: OPTS UTF8 ON
Response: 200 Always in UTF8 …