Windows Server 2012 R2 cipher TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

Question

Hi,

I am facing a problem while making httprequest from my application that developed with .net framework 4.8.
It threw an error like this "The request was aborted: Could not create SSL/TLS secure channel." and in event log wrote "A fatal alert was received from the remote endpoint. The TLS protocol defined fatal alert code is 40."

I digged a little deeper and captured network dump using microsoft network monitor. The error is TLS: TLS Rec Layer-1 Encrypted Alert.

The server side waits TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 cipher suite from win2012R2 but it does not support it. ( https://learn.microsoft.com/en-us/windows/win32/secauthn/tls-cipher-suites-in-windows-8-1 )

I tried to add manualy but nothing change. Will microsoft issue an update patch for this problem?

I am looking forward to hear from you. Thanks in advance