[AccessD] ,NET com dll with Access

[dw-murphy at cox.net]

All,

This is probably off topic but I'll ask. About 10 years ago I started
working with a client whose business is buying and selling industrial
controllers and associated hardware on eBay. He was keeping track of
inventory, buying, and selling in an Access application. He had the idea of
automating many of his eBay interactions through the Access application. I
created some COM dlls in Visual Studio that interact with api's eBay
publishes. This extended their functionality to Access. This has worked
great, until last week. He stared getting an error message "The request was
aborted: Could not create SSL/TLS secure channel". eBay recently moved all
their connections to use TLS 1.5. 

I looked this up and found that the .NET framework version I was using did
not support TLS 1.5 but that frameworks 4,7 and above do. So I changed
frameworks for the dll projects to 4.7 and recompiled and registered the
dll's. When testing the dll's from a test harness I created in Visual Studio
everything worked fine and communications with eBay were re-established.
When I added the new dll to the Access application I got the TLS error
again. Very puzzling, and frustrating. To see if I could see what is going
on I looked at the network communication from the app using Fiddler. When I
make the calls from the Visual Studio app I see we are using TLS 1.5. When I
run from Access the communication is using TLS 1.0. Both are referencing the
same dll file.

This is way beyond my pay grade. I know very little about communication
security, Windows settings or anything else that might contribute to this
issue. Posted a question on StackOverflow and have gotten one response so
far from Albert Kallal which I'll investigate tomorrow. It has to do with
registry settings on the client computer. 

I know some of you folks on this list work with Visual Studio and Access.
Have you experienced these issues? Any thoughts on where to look?

Thanks in advance.

Doug