Disconnecting & connecting tcpsocket with proxy problem

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1)Only fin,ack from my app and previous ack packet sequence and ack numbers equal.

2)Uh, i haven't understood a question.
fin,ack packet's rst flag is not set.
Or you talk about Qt class qtcpsocket's some kind of reset flag?

3) socket disconneting in the same way, but even after first syn|syn,ack|ack chain( i mean no http connection | http conenction established here )