Problem with "tcpwrapped" port

[HaJin <hajin3 () gmail com>]

Hello,

I have a windows machine with tcp port 21 open. But when I try to
connect to it i get normal 3 way handshake and then a RST packet. I
know this machine was heavily infested a while ago. Is it possible
that this is some sort of backdoor ? Are there any tools to attack
such ports (i.e try every source address or something like that) ?

Thanks,

  HaJin

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