I've developed an application using .net core 2.1 and C#, in this app I call an API over HTTPS (SSL) in the Windows Version the Self Contained app works ok but on Mac I got the following error:
System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. ---> System.PlatformNotSupportedException: X509Chain at Internal.Cryptography.Pal.SecTrustChainPal.PreparePoliciesArray(Boolean checkRevocation) at Internal.Cryptography.Pal.SecTrustChainPal.OpenTrustHandle(ICertificatePal leafCert, X509Certificate2Collection extraStore, X509RevocationMode revocationMode) at Internal.Cryptography.Pal.ChainPal.BuildChain(Boolean useMachineContext, ICertificatePal cert, X509Certificate2Collection extraStore, OidCollection applicationPolicy, OidCollection certificatePolicy, X509RevocationMode revocationMode, X509RevocationFlag revocationFlag, DateTime verificationTime, TimeSpan timeout) at System.Security.Cryptography.X509Certificates.X509Chain.Build(X509Certificate2 certificate, Boolean throwOnException) at System.Security.Cryptography.X509Certificates.X509Chain.Build(X509Certificate2 certificate) at System.Net.CertificateValidationPal.VerifyCertificateProperties(SafeDeleteContext securityContext, X509Chain chain, X509Certificate2 remoteCertificate, Boolean checkCertName, Boolean isServer, String hostName) at System.Net.Security.SecureChannel.VerifyRemoteCertificate(RemoteCertValidationCallback remoteCertValidationCallback, ProtocolToken& alertToken) at System.Net.Security.SslState.CompleteHandshake(ProtocolToken& alertToken) at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.PartialFrameCallback(AsyncProtocolRequest asyncRequest) --- End of stack trace from previous location where exception was thrown --- at System.Net.Security.SslState.ThrowIfExceptional()
at System.Net.Security.SslState.InternalEndProcessAuthentication(LazyAsyncResult lazyResult) at System.Net.Security.SslState.EndProcessAuthentication(IAsyncResult result) at System.Net.Security.SslStream.EndAuthenticateAsClient(IAsyncResult asyncResult) at System.Net.Security.SslStream.<>c.b__47_1(IAsyncResult iar) at System.Threading.Tasks.TaskFactory1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endFunction, Action1 endAction, Task1 promise, Boolean requiresSynchronization) --- End of stack trace from previous location where exception was thrown --- at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)
X509Chain: I guess the problem comes from not having the same CAs in your trust stores in both cases. – Patrick Mevzek