I cannot reach your domain using HTTP using curl. The Let's Debug test site cannot reach your domain and its test with LE Staging fails with same timeout as your production request.
I don't know how a request from a browser would work any differently than HTTP requests using other tools.
Something is blocking HTTP requests. Are you sure you don't have a firewall or a problem with your network and/or port routing?
From my own test server in an AWS US east coast region
curl -i -m8 http://nbs.sec-comms.net
curl: (28) Connection timed out after 8000 milliseconds
The Let's Debug site is very helpful when setting up new sites
ALSO, the EFF has dropped support for Certbot on Windows as of last month. You should avoid using it for new setups. See another of my posts about that here: