http error on upload !!

[shahzaib shahzaib]

We're receiving http error most of the time when uploading files with
500MB. We're using nginx+php-fpm.

nginx client_max_body_size is set to 3000M.

php.ini settings are

upload_max_size 3000M
post_max_sive    3000M
max_execution_time 6400
max_input_time 6400
memory_limit 2048

php-fpm timeout setting is 60sec.

What more i need to check ?

Regards.
Shahzaib
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