Why does he STOP in the fxp transfer ?

[twisted]

[17:42:50] [L] PORT ss
[17:42:50] [L] 200 Port command successful.
[17:42:50] [L] STOR file1.rar
[17:42:50] [L] 150 Opening data connection for file1.rar.
[17:42:50] [R] RETR file1.rar
[17:42:50] [R] 150 Opening BINARY mode data connection for file1.rar.
[17:43:36] [R] 200 NOOP command successful.
[17:43:36] [L] 200 NOOP command successful.
[17:43:48] [R] 226-[Section: Default]-[Free: 2.36GB]-[Ratio: 1:3]-[Speed: 840.9kb/s]
[17:43:48] [R] 226 Transfer complete.
[17:44:03] [R] ABOR
[17:44:03] [R] 226 ABOR command successful.
[17:44:03] [L] ABOR
[17:44:03] [L] 226 ABOR command successful.
[17:44:03] [L] Transfer Failed!

the port has been altered.

Im getting this strange problem , the only solution is to abort the transfer and then start it all over again , but doing this is boring , any idea why it behaves like that ?

Ifs not one of ftp , its on many. and they are running , ioftpd , raiden , ?