We have a .NET web server hosted on NancyFx, that we are trying to keep working cross-platform between Windows 7 and 10. We recently migrated from HTTP to secure HTTPS, and there is a discrepancy. Looking from Chrome dev tools, our server running on Windows
7 is serving requests with TLS 1.0, while on Windows 10 it is using TLS 1.2. We have tried a number of instructions, published by Microsoft and others, but none of them had any effect:
https://docs.microsoft.com/en-us/configmgr/core/plan-design/security/enable-tls-1-2
https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-wi
https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls#configuring-security-via-the-windows-registry
https://docs.microsoft.com/en-us/windows-server/security/tls/tls-registry-settings
https://docs.microsoft.com/en-us/windows/win32/secauthn/protocols-in-tls-ssl--schannel-ssp-?redirectedfrom=MSDN
https://documentation.cpanel.net/display/CKB/How+to+Configure+Microsoft+Windows+7+to+use+TLS+Version+1.2
https://mycloudtree.co.uk/knowledgebase/19/Enabling-TLS12-on-Windows-7.html
https://www.ryadel.com/en/enable-tls-1-1-1-2-windows-7-8-os-regedit-patch-download/
The application targets .NET 4.0, but we are are currently running it on the latest .NET Framework installation 4.8. We know this had previously fixed issues with TLS support for our .NET client applications.
The application does set the SecurityProtocol globally (in try/catch in case that is not available): ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
Is there any way for us to check that TLS 1.2 is available in any way, shape or form on that system? That would be a Windows 7 embedded target platform, though we are also testing on Windows 7 Professional.
I don't think we have to change anything within the application code itself, but I may be wrong about that.
Activating TLS 1.2 on Windows 7 for .NET web server
