Filezilla 无法连接到我的 ftp，但我可以使用ftp://ftp.xxxxx.com在 Windows 资源管理器或浏览器中使用相同的详细信息连接到 ftp
日志是：
2015-10-05 22:31:27 6908 1 Status: Resolving address of ftp.xxxxx.com
2015-10-05 22:31:27 6908 1 Status: Connecting to 50.87.57.52:21...
2015-10-05 22:31:27 6908 1 Status: Connection established, waiting for welcome message...
2015-10-05 22:31:27 6908 1 Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
2015-10-05 22:31:27 6908 1 Response: 220-You are user number 5 of 1000 allowed.
2015-10-05 22:31:27 6908 1 Response: 220-Local time is now 11:01. Server port: 21.
2015-10-05 22:31:27 6908 1 Response: …