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I have a problem with FTP upload from the client to the server

I am uploading a file to ftp server. The transfer works fine initially but after some time I am seeing lots of dup acks from the server and retransmission from the client. Our network team thinks that its a network bandwidth issue and would be better if we upgrade the bandwidth for this site. I wanted a second opinion in this case is there a possibility that TCP stack or application could be at fault looking at the wireshark data.

Thanks Vic