full-disclosure - SYN ACK scans to random ports

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Message-Id: <20130924124956.7DEFFA0153@smtp.hushmail.com>
Date: Tue, 24 Sep 2013 06:49:56 -0600
From: silence_is_best@...hmail.com
To: "Full Disclogure" <full-disclosure@...ts.grok.org.uk>
Subject: SYN ACK scans to random ports

Can someone explain the point of a SYN ACK scan to random high ports? 
I usually see a fair amount of these...at first I thought it was maybe
a block to an initiating SYN packet, but I don't see any evidence that
the SYN ACK isn't the first packet seen.  Danke. 

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