Problem is that your hoster isn’t using any ciphers that are supported with Windows 2012 or 2008 R2 or 2008 R1 servers. https://docs.microsoft.com/en-us/windows/desktop/secauthn/tls-cipher-suites-in-windows-8
We do have TLS 1.2 enabled. I would say that TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 needs to be added to your hosts cipher list, it’s the highest that 2008r2/2012/2012R2 can go to.
Either that or have the App use a different engine such as Firefox or Chrome, as IE outside of Server2016/Win10, doesn’t support TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
