@jlfranklin mentioned Database SSL Check in https://github.com/backdrop/backdrop-issues/issues/4772#issuecomment-778.... That is a D7/D8 module, and it could of course be ported to Backdrop contrib, but it's only a ~40-line implementation of hook_requirements(): https://git.drupalcode.org/project/database_ssl_check/-/blob/7.x-1.x/dat... ...so I believe that it could be a nice addition to core, as part of #3624.
I've installed the module in Backdrop (simply modifying it's .info file), and this is what it adds:

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The simple way is - View source code - Copy and paste what you need - Bold can be easily added with <b> or <strong> tags
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I have had a read of what Lando provides, and it's an excellent development tool, and it would solve the problem. But, I would prefer to find out why the problem is there in the first...
How often is the settings.php loaded.
Thanks for the info. I will give it a try...
How often is the settings.php loaded.