用FLASHFXP上传某个文件经常失败，请问是什么回事呢？

[右] 连接丢失: 210.51.45.8
[右] 正在试图重新连接。
[右] 正在连接到 210.51.45.8 -> IP=210.51.45.8 PORT=21 (尝试 # 1)
[右] 已连接到 210.51.45.8
[右] 220 Microsoft FTP Service
[右] USER ball99882
[右] 331 Password required for ball99882.
[右] PASS (隐藏)
[右] 230 User ball99882 logged in.
[右] SYST
[右] 215 Windows_NT
[右] FEAT
[右] 211-FEAT
[右]     SIZE
[右]     MDTM
[右] 211 END
[右] CWD /ball99882/web/bbs/DataBase
[右] 250 CWD command successful.
[右] PWD
[右] 257 "/ball99882/web/bbs/DataBase" is current directory.
[右] TYPE I
[右] 200 Type set to I.
[右] PASV
[右] 227 Entering Passive Mode (210,51,45,8,27,4).
[右] 正在打开数据连接 IP: 210.51.45.8 端口: 6916
[右] STOR BBSXP7.mdb
[右] 125 Data connection already open; Transfer starting.
[右] 传送失败!

请问是什么回事呢？还有出现这个情况之前提示要覆盖原文件