[16:34:51] [R] 连接失败 (Connection closed by server)为什么会链接失败

　　[16:32:58] FlashFXP 5.4.0 (build 3960)

　　[16:32:58] Support Forums https://www.flashfxp.com/forum/

　　[16:32:58]

　　[16:32:58] Winsock 2.2 -- OpenSSL 1.1.0e 16 Feb 2017

　　[16:34:40] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21

　　[16:34:40] [R] 已连接到 www.2.youhai.com

　　[16:34:40] [R] 220 Microsoft FTP Service

　　[16:34:40] [R] USER wutianxiang1

　　[16:34:40] [R] 331 User name okay, need password.

　　[16:34:40] [R] PASS (hidden)

　　[16:34:40] [R] 530 Not logged in.

　　[16:34:40] [R] 连接失败 (Connection closed by server)

　　[16:34:40] [R] 尝试重新连接 #10 次后延迟 1 秒

　　[16:34:50] [R] 正在尝试重新连接.

　　[16:34:50] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21 (次尝试 # 1)

　　[16:34:50] [R] 已连接到 www.2.youhai.com

　　[16:34:50] [R] 220 Microsoft FTP Service

　　[16:34:50] [R] USER wutianxiang1

　　[16:34:51] [R] 331 User name okay, need password.

　　[16:34:51] [R] PASS (hidden)

　　[16:34:51] [R] 530 Not logged in.

　　[16:34:51] [R] 连接失败 (Connection closed by server)

　　[16:34:51] [R] 尝试重新连接 #120 次后延迟 2 秒

　　[16:36:53] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21 (次尝试 # 2)

　　[16:36:53] [R] 已连接到 www.2.youhai.com

　　[16:36:53] [R] 220 Microsoft FTP Service

　　[16:36:53] [R] USER wutianxiang1

　　[16:36:53] [R] 331 User name okay, need password.

　　[16:36:53] [R] PASS (hidden)

　　[16:36:53] [R] 530 Not logged in.

　　[16:36:53] [R] 连接失败 (Connection closed by server)

　　[16:36:53] [R] 尝试重新连接 #120 次后延迟 3 秒

　　[16:38:55] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21 (次尝试 # 3)

　　[16:38:55] [R] 已连接到 www.2.youhai.com

　　[16:38:55] [R] 220 Microsoft FTP Service

　　[16:38:55] [R] USER wutianxiang1

　　[16:38:55] [R] 331 User name okay, need password.

　　[16:38:55] [R] PASS (hidden)

　　[16:38:55] [R] 530 Not logged in.

　　[16:38:55] [R] 连接失败 (Connection closed by server)

　　[16:38:55] [R] 尝试重新连接 #120 次后延迟 4 秒

　　[16:40:57] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21 (次尝试 # 4)

　　[16:40:57] [R] 已连接到 www.2.youhai.com

　　[16:40:57] [R] 220 Microsoft FTP Service

　　[16:40:57] [R] USER wutianxiang1

　　[16:40:57] [R] 331 User name okay, need password.

　　[16:40:57] [R] PASS (hidden)

　　[16:40:58] [R] 530 Not logged in.

　　[16:40:58] [R] 连接失败 (Connection closed by server)

　　[16:40:58] [R] 尝试重新连接 #120 次后延迟 5 秒

　　[16:42:59] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21 (次尝试 # 5)

　　[16:42:59] [R] 已连接到 www.2.youhai.com

　　[16:43:00] [R] 220 Microsoft FTP Service

　　[16:43:00] [R] USER wutianxiang1

　　[16:43:00] [R] 331 User name okay, need password.

　　[16:43:00] [R] PASS (hidden)

　　[16:43:00] [R] 530 Not logged in.

　　[16:43:00] [R] 连接失败 (Connection closed by server)

　　[16:43:00] [R] 尝试重新连接 #120 次后延迟 6 秒

　　[16:45:02] [R] 正在连接到 www.2.youhai.com -> DNS=www.2.youhai.com IP=103.216.218.115 PORT=21 (次尝试 # 6)

　　[16:45:02] [R] 已连接到 www.2.youhai.com

　　[16:45:02] [R] 220 Microsoft FTP Service

　　[16:45:02] [R] USER wutianxiang1

　　[16:45:02] [R] 331 User name okay, need password.

　　[16:45:02] [R] PASS (hidden)

　　[16:45:02] [R] 530 Not logged in.

　　[16:45:02] [R] 连接失败 (Connection closed by server)

　　[16:45:02] [R] 尝试重新连接 #120 次后延迟 7 秒