Hi @silvia, thanks for your support, I was trying with NDIS on PDP context 1, I deactivated the PDP context and enabled a different one but no luck, it kept refusing to connect.
However, I changed it to RNDIS mode, then deactivated PDP context 1, then configured PDP context 2 according to this other post: RG520N-EU - Unable to Open a TCP connection - IoT Modules / 5G Module - Quectel Forums
and then enabled PDP context 2 and was finally able to open TCP/Sockets, I’m not sure why this worked, but at least is working now.
Regards.