I'm unable able to establish a two way TLS 1.2 authentication to some customer servers since they increased the size of the handshake message.
The AuthenticationException happens with both System.Net.HttpClient and System.Net.Security.SslStream :
System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted
Win32 (SChannel) Native Error Code: 0x80090326
While this problem was easily solved by setting jdk.tls.maxHandshakeMessageSize to a higher value in any java client, I can't find the same workaround for .NET.
I'm using .NET Framework 4.7.2