Can't connect sockets to send data with FreeRTOS-TCP

[RAc]

This appears to be a similar issue to this here:

FreeRTOS+TCP:STM32 TCP Client can't connect to PC Server until PC ping successfully to STM32

I set up a TCP client on the STM32F407, and try to connect to the server on the PC. But the connection was unsuccessful every time. When I opened the cmd terminal on the PC and ping the STM32, found that the TCP client was connected immediately. After pinging the client, the client was able to connect to the server immediately. Do you know what causes this? I also found the eARPGetCacheEntry always return “eARPCacheMiss” in prvTCPPrepareConnect function when TCP client can’t connect to the ser…

Can you go over that thread and see if there is useful info for you there?