What do TCP connection states like Last-ack, Fin-wait-1, and Syn-send mean?

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Deniel
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Can you tell me what the mechanism of da command
"NETSTAT -A" is ?

and in the state column, i have seen Last-ack, Fin-wait-1, syn-send
What are they, and how are they created sytematically in actuallity ? Would you please give me examples to prove anything you say too ? Being without any particular examples is also fine but please help clearify them for me..

Thanks
 
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By theway, i also see ESTABLISHED.
What I should do then ? Please help True, I think there is someone hacking me.
 
man page

are you using windows? if true the link above can still clarify some things... just look at the output section