Not able to connect to local instance with .net when tls is turned on

Hi,

I’ve recently been working to turn on tls for all communication to/from mongodb. So far, I’ve been able to connect with compass and mongosh from outside of docker desktop. To test the communication method recommended in the setup instructions, I created a basic webapi with a service to do the connection:

public MongoDbService(IConfiguration configuration)
    {
        // Get MongoDB connection string and database name from configuration
        //var connectionString = configuration.GetConnectionString("MongoDb");
        var settings = MongoClientSettings.FromConnectionString("mongodb://localhost:27017/?authMechanism=MONGODB-X509");
        var clientCert = new X509Certificate2("mongodb-client.pem");
        var caCert = new X509Certificate2("ca.pem");

        settings.UseTls = true;
        settings.SslSettings = new SslSettings
        {
            ClientCertificates = new List<X509Certificate> { clientCert, caCert },
            EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12, // Ensure TLS 1.2 or higher
            CheckCertificateRevocation = false, // Adjust based on your environment requirements
            ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true // Adjust based on your environment requirements
        };

        var client = new MongoClient(settings);

        var database = client.GetDatabase("test-db"); // Replace with your database name
        _collection = database.GetCollection<BsonDocument>("test-table"); // Replace with your collection name 
    }

If I step through the code I can see the ca and client files in the sslsettings field but the logs for mongodb show no ssl certificates being provided:

image2089×96 12.3 KB

I’ve tried with MTLS turned on and off with the same effects.

My MongoDB.Driver is v2.28.0 and MongoDB is v7.0.14

Hoping you guys can help.