>We've been working on re-writing this application (and middleware as well) into C# Web Application for our big VFP application and into C# dll for our VFP dlls. It's been 5+ years and still going (perhaps about 1 more year of work to complete). Fixing all VFP code doesn't seem practical...
>
>I was hoping for some relatively easy to implement solution. So far I got the idea that this client can probably use this Devart driver instead of SQL Server driver, which may be the best option for us.

Naomi,

Please bear in mind that you still have to find out if the Devart drivers are TLS 1.2 capable. SSL for sure; TLS 1.2? I don't know...

A different approach you could investigate is to check on a TLS proxy. Don't ask me for details, for I don't have none to give, but the idea behind it is to allow for TLS negotiation with systems that don't speak TLS. A reference (and this will be the farthest I can go): https://en.wikipedia.org/wiki/Stunnel.