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Hi

Each [TCP ACKed unseen segment] means that you captured a TCP ACK packet but did not capture the actual data that was received and acknowledged.

In other words, Apple's server at 17.42.254.12 sent some data to the host at 192.168.138.139.

The host at 192.168.138.139 received that data and sends a TCP ACK back to Apple but you only captured that TCP ACK and not the data Apple sent.

This can happen when Wireshark or your capture device drops packets while capturing.

Cheers,

Spooky