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File upload through HTTP problem

Hello,

I'm trying to write a firmware update through Web server on the board AT91SAM9620. For this I'm using a form with ENCTYPE="multipart/form-data" and a function cgi_process_data(). Very often the file has been damaged. (crc32 checking don't pass) It looks like that the file uploading session has been terminated incorrect (the web server does not reloads the page.) I've tried with IE, FireFox and Chrome a result is the same. I've noticed that with FireFox these problem is more often. The file size is about 200KB. Using debug version TCP/IP library in terminal window appear:"TCP ERR: Out of range sequence number received" at the time of the file is uploading. I think that these errors is the reason of file damage.
I'm using RL-ARM v4.12
Has anyone tried to send the file through http on the board AT91SAM9620 ?
How can I fix this problem?
Any ideas please?

Best regards
Taris T