Hello Dani, I'm reading through the NetX Source Code and I can see that NX_INVALID_INTERFACE is returned only when the MTU for your interface is smaller than combined size of IP and TCP headers (i.e. the smallest packet won't fit in the MTU). Please verify that your interface is already initialized by calling nx_ip_status_check before creating and attempting to connect using TCP, uninitialized interface will have MTU set to 0. Regards
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