[CentOS] FTP timout

Hi all,
    I have 2 CentOS 3.5 boxes & i do backups on the LAN
Recently, I always get FTP timout error with large files "700 MB and more" . 

i tried to log and do manual backup with FTP command and i also got the same result "FTP timeout"

i tried to google and i did 
# modprobe ip_conntrack_ftp
but still get the same timeout message

Any one can help???

Hameed
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