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Tcp/ip
The command option sS SYN Stealth Scan performs a scan using the initial TCP handshake.
the station window size
the congestion window
memory buffers receipt acknowledgement
It indicates the "number of bytes the device is willing to accept".
Change window size and max window size in the registry. Navigate to:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters