ftp keep stalling? timeout even though files still being uploaded

One of my clients having problem in uploading files. The connection would stall or stop (timeout) even though files are being uploaded.

I tried switching between pure/proftpd but no luck.

150 Opening BINARY mode data connection for default_invoice.htm
3826 bytes sent successfully. (3.74 KB/s) (00:00:01).
Connection closed. Timeout (20s).
PASV
Command aborted. Timeout (20s).

Any idea?

 

 

 

 

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