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

[Harald Kipp]

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.

Harald