As shown by the message you need an internet connection to login.
Then login:
But you need first to create a profile in st.com. or click on Create Account button;
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You can connect either with WiFi or Ethernet cable or even 4G/5G.. no matter the media is .. the most important is the internet connection.
Try to check CubeMx internet connection:
then go to Connection parameters and click on "Check Connection". You need to get a green status like shown in the following figure:
Otherwise check your proxy parameters. In that case try to select select "Use System Proxy Parameters".
"To give better visibility on the answered topics, please click on ""Accept as Solution"" on the reply which solved your issue or answered your question."