Hello,
What is “unclassified”?
Not sure about your conditions. You did not share much info. Actually, you did not share any info…
However, I found similar/same thing and based on instructions, I reported this to support with Ticket#2018053122000411
In my case it was happening on 6.42.1 and 6.42.3 anytime I used TCP btest (does not matter if it was client/server. Never happened on UDP btest)
They confirmed they were able to reproduce it and they promised it will be fixed in upcoming release.
Right now, I tried it on 6.42.6 and it is still happening, so no fix was released yet.
This is obviously not really serious issue. What we see in “profile” is just grouped list of processes based on some rules. During TCP transmission, there is apparently some networking process which is not properly categorized and ends up in “unclassified” group.