Can't download... connection timeout

[BataL]

hi there,

theres another thing i noticed during my last test:
i am able to download files with lower size (5mb are okay), when i try to get a 600 mb file i have for about 20-30 sec. full speed and then it slows down to zero (

edit: i didnt check the send noops during transfer, but the anti-idle option

sry, but i need a little help. any ideas how to fix this problem. or where the problem could be located?

btw: this is no cracked version.