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TCP Previous Segment not Captured

Trying to solve issue for getting quickbooks updates during what looks like three attempts to pull updates from their apache download servers: first error is TCP Previous segment not captured from quickbooks server to our system. Also TCP Retransmission ACK in both directions during exchanges

tcp_retransmission segment_not_captured tcp-segment tcp retransmissions

asked 19 Jun '17, 14:47

QuickN
6●1●1●2
accept rate: 0%

One Answer:

A sample capture would help. Only one (or few) "Previous Segment not Captured" towards the beginning usually is due to an ongoing TCP connection when the capture begins. If you have more down the line it suggests the capture itself it not keeping up (so it misses the data packet but sees the ACK). You get just ACK retransmission or data retransmission also?

answered 20 Jun '17, 23:30

silvio
31●2
accept rate: 50%

Thanks ..looks like I can upload pic file in JPG the pcapng wouldnt upload for some reason

Thanks Mike

(21 Jun '17, 05:20) QuickN

Analysis by screenshot is painful and mostly unproductive, i.e. we want to see things that aren't visible.

Can you share a capture in a publicly accessible spot, e.g. CloudShark?

(21 Jun '17, 06:51) grahamb ♦