Why can't I make a connection with AzureDataSudio?

Question

I am running SQL Server Linux container images with Docker on Debian Linux version 11.

I have connected successfully as 'root@sql1' from the command line with username 'SA':

I have downloaded AzureDataStudio, but can't make a connection:

Note that I am using the same password. I have entered the port '1433' under Advanced Settings, and this leads to the following error:

Thank you.