连接模式：有效
连接到ftp时会显示
Command: PORT 110,44,125,15,212,139
Response: 200 PORT command successful
Command: MLSD
Response: 425 Could not open data connection to port 54411: Connection refused
Error: Failed to retrieve directory listing
但我可以在linux终端上成功连接并列出其目录。问题仅在于filezilla。（无法检索目录列表）