This is generally a time out connecting to a web resource.

I have found a lot of "fixes" on how to correct this issue but very few on how to isolate where the problem is.  This is especially with Drupal where all you get is this general error:

Case:

We have a site on pantheon and we use lando for local development

We will created a lando instance and use tome to transition to a static html site.
I will also create a separate lando instance to not interfere with the live site/development just because.
And will create a gitlab repository and host the site on gitlab since it will be pure html