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An ACK packet got lost in a TCP three way handshake

My server sends an SYN packet and the other end(another customer server) respond with SYN-ACK but the customer server sends a re-transmition because it couldn't get the ACK packet. I have captured the packet and i can see the ACK on the server, serverfarm switch, but i couldn't see it on my ASA firewall. what could be the possible reason, any help is appriciated.