"Xia Tao" <[EMAIL PROTECTED]> writes:

> But after the Nessus scans the system, there are some permanent
> ESTABLISHED TCP connections . 

Did you implement TCP keep alive?

Socket Options
       These socket options can be set by using setsockopt(2)  and  read  with
       getsockopt(2) with the socket level set to SOL_SOCKET for all sockets:

       SO_KEEPALIVE
              Enable  sending  of  keep-alive  messages on connection-oriented
              sockets. Expects a integer boolean flag.
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