PROTOTYPE
Hi, I have experience with AWS (EC2, ECS, Cloudwatch, RDS, etc.) in my company and I have been using Python and more than one variant of Linux (Ubuntu, CentOS) at work for several years. From your screenshot it seems that the server cannot respond the client in time, resulting in a timeout. It might be network problem, or server high CPU usage, or something else. I might be able to help, or at least provide some advice if you would share some more information.
I personally do not really care if I get the job and get paid or not - I just love to see bugs or problems or mysterious errors being solved.
Thank you.