Initial Description of the issue ref : https://jira.mongodb.org/browse/CSHARP-3113

We are trying to implement SSL authentication with the MongoDB 4.0 version using the below connection string and facing authentication issues.

 mongodb://username:password@hostname:27017/?authSource=admin&readPreference=primary&ssl=true&sslPEMKeyFile=C:/etc/ssl/client.pem"

At MongoDB log, we see the application connections are closing immediately with error message :

encountered a network error during SourceMessage: SocketException: no shared cipher

application log: 
2020-02-20 12:39:53 [Debug] Failed to authenticate HTTPS connection.
Properties: { EventId:

{ Id: 1 }

, SourceContext: "Microsoft.AspNetCore.Server.Kestrel.Https.Internal.HttpsConnectionMiddleware", ConnectionId: "0HLTM5FID0INL", Application: "DCDService" }
MachineName: NB1999-01924579
System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
   at System.Net.Security.SslStream.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslStream.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslStream.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslStream.ProcessAuthentication(LazyAsyncResult lazyResult, CancellationToken cancellationToken)
   at System.Net.Security.SslStream.BeginAuthenticateAsServer(SslServerAuthenticationOptions sslServerAuthenticationOptions, CancellationToken cancellationToken, AsyncCallback asyncCallback, Object asyncState)
   at System.Net.Security.SslStream.<>c.<AuthenticateAsServerAsync>b__69_0(SslServerAuthenticationOptions arg1, CancellationToken arg2, AsyncCallback callback, Object state)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncImpl[TArg1,TArg2](Func`5 beginMethod, Func`2 endFunction, Action`1 endAction, TArg1 arg1, TArg2 arg2, Object state, TaskCreationOptions creationOptions)
   at System.Threading.Tasks.TaskFactory.FromAsync[TArg1,TArg2](Func`5 beginMethod, Action`1 endMethod, TArg1 arg1, TArg2 arg2, Object state, TaskCreationOptions creationOptions)
   at System.Threading.Tasks.TaskFactory.FromAsync[TArg1,TArg2](Func`5 beginMethod, Action`1 endMethod, TArg1 arg1, TArg2 arg2, Object state)
   at System.Net.Security.SslStream.AuthenticateAsServerAsync(SslServerAuthenticationOptions sslServerAuthenticationOptions, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Https.Internal.HttpsConnectionMiddleware.InnerOnConnectionAsync(ConnectionContext context)
 

Activity Performed by us after steps recommended by Mongodb : 

Hello, 

I have followed by steps mentioned in Previous ticket 

1) Create a pfx format file using below instructions 

2) Code Snippet from the app config file 

Here is the code used to connect with the x509 cert:

        public static IContextOptions UseMongoFactory(this IContextOptions options, DatabaseSettings settings)

        {

            var setting = new MongoClientSettings

            {

                // if a username is null, the distinguished name from the certificate will be used

                Credential = MongoCredential.CreateMongoX509Credential(null),

                SslSettings = new SslSettings

                {

                    ClientCertificates = new List<X509Certificate>()

                   

{                         // Instert Pem File Location and Passphrase                         new X509Certificate2(settings.CertificatePath, settings.Passphrase)                     }

,

                },

                UseTls = true,

                Server = new MongoServerAddress(settings.ServerName, settings.PortNumber),

                // For testing using self-signed certs, use this option to skip validation.

                // DO NOT USE THIS OPTION FOR PRODUCTION USES

                AllowInsecureTls = true

            };

            var context = new MongoClient(setting);

            options.DatabaseName = settings.DatabaseName;

            options.Logger = Log.Logger;

            options.Factory = new MongoFactory(options, context);

            return options;

        }

Exception Details : 

Exception:

MongoDB.Driver.MongoAuthenticationException

HResult=0x80131500

Message=Unable to authenticate username '' using protocol 'MONGODB-X509'.

Source=MongoDB.Driver

StackTrace:

at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression)

at MongoDB.Driver.Linq.MongoQueryableImpl`2.GetEnumerator()

at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)

at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

at RemoteDbContextStd.MongoEntity`1.ToList() in C:\Users\gbaril\source\repos\Experiments\RemoteDbContextStd\RemoteDbContextStd\MongoEntity.cs:line 143

at ConfigServer.Features.ConfigServer.Services.ConfigServices.<GetConfigCollection>b__5_0() in C:\Users\gbaril\source\repos\ConfigService\ConfigService\Features\ConfigServer\Services\ConfigServices.cs:line 81

at System.Threading.Tasks.Task`1.InnerInvoke()

at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)