RA6M4 - FSP 5.4.0 - Azure OS - NetX Duo no arp response

Hello,


I use a BSD socket client to communicate with a server.
Most of the time it works fine.


But sometimes, the connection breaks for a reason than I don't know.


From this break, my socket can never reconnect to the server.
This happens at a customer, but I can't reproduce it at home.


However, I have a Wireshark frame that allows me to see what is not working :

When my socket tries a new "SYN" on the server IP address, the server makes an ARP request to know my IP address, and my RA6M4 never responds to this ARP request.
At the end of the TCP retry of the "SYN", another "SYN" is send, a new ARP request is made by the server, and the RA6M4 never sends another response.
It never works again without rebooting the system.
Any idea what can happen ?

Best Regards
Phil

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