[En-Nut-Discussion] Missing [SYN, ACK] packets when NutTcpConnect() attempts to connect to a .NET TcpListener socket server

Harald Kipp harald.kipp at egnite.de
Fri Nov 9 19:20:03 CET 2007

Hi Erik,

Erik Lindstein schrieb:
> If i analyze the trafic with wireshark i can se that the ethernut
> board sends [SYN] packets but the PC doesn't respond with anything.
> I don´t have any knowledge about how the low level TCP communication
> work's but i can se that when the communication works the PC sends
> [SYN, ACK]
> after ethernut sends [SYN].
The client sends a SYN and the server has to respond with SYN/ACK.

I agree with Alain, it looks like an ARP problem. On the PC try
arp -a
and see whether the Ethernut is in the list with the correct MAC/IP pair.


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