ok, i took off all the scripts...
after my testing....
it only happened on mount driver(Network disk)....when uploading is over 800K/sec... if the transfer speed is under 800K it wont happen...
wont happen on local driver......
i also install serv-u ftpd .... and login serv-u when user uploading into ioftpd ...
the serv-u working fine on show mount dirver, and everything is fine also ....
so, i guess... it maybe ioftpd's problem... coz my last version of ioftpd (4.1.5) is working fine....
any suggestion ??