TCP ACKed unseen segment

asked 2018-10-23 21:00:43 +0000

dkneverland
1 ●1 ●1 ●2

updated 2018-10-23 21:01:33 +0000

Hi All

We are having issues with one of our Meraki Wireless SSID's not allowing Apple iOS App Store updates etc, but works fine on Android and the Play store.

Can someone explain what the attached means please? https://imgur.com/a/HBkq56B

Thanks heaps

answered 2018-11-06 03:17:14 +0000

Spooky

191 ●47 ●7 https://www.wireshark.org

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

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