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Connection to SQL Server from .NET Core on Ubuntu fails with SSL/TLS handshake error

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I have a .NET Core console application that connects to a SQL Server database. The application works fine on Windows, but I'm encountering an SSL/TLS handshake failure when running it on an Ubuntu 22.04 LTS VM .

class Program{    static void Main()    {        var connectionString = "Data Source=DB*****;Initial Catalog=efdfdApi;User Id=useridd;Password=*****;Connect Timeout=30;Encrypt=false;TrustServerCertificate=true;Application Intent=ReadWrite;MultiSubnetFailover=false";        try        {            using (var connection = new SqlConnection(connectionString))            {                connection.Open();                Console.WriteLine("Connection successful!");            }        }        catch (Exception ex)        {            Console.WriteLine($"Connection failed: {ex.Message}");        }    }}

Issue: When I execute dotnet TestConnection.dll on my Ubuntu VM, I get the following error:

Connection failed: A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 31 - Encryption(ssl/tls) handshake failed)

Additional Information:

  • I've verified that the connection string is correct and works on Windows.

  • I suspect there might be SSL/TLS configuration differences between Windows and Ubuntu that I need to address.

  • <PackageReference Include="Microsoft.Data.SqlClient" Version="5.2.1" />

I used these

sudo apt-get update
sudo apt-get install -y libssl-dev ca-certificates libkrb5-dev
sudo apt-get install openssl
sudo apt-get update
sudo apt-get install -y libssl-dev ca-certificates libkrb5-dev
sudo apt-get install ca-certificates

What steps should I take to troubleshoot and resolve this SSL/TLS handshake failure when connecting to SQL Server from .NET Core on Ubuntu?


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