Windows环境下Mono连接SQL Server提示“TLS Support is not available”求助

Hey there, I’ve run into this exact issue before with Mono on Windows—let’s get your SQL Server connection working properly. The core problem here is that unlike Linux (where the ca-certificates-mono package handles certificate setup automatically), Mono on Windows doesn’t automatically sync with the system’s root certificates, which breaks TLS connections to SQL Server.

Here’s what you need to do:

• Sync Windows root certificates to Mono’s certificate store
  Mono maintains its own separate certificate store, so you’ll need to import your Windows system certificates into it. Open a command prompt pointed to your Mono installation’s bin directory (usually C:\Program Files\Mono\bin), then run this command:

  mozroots --import --sync
  

  This command pulls in trusted root certificates and syncs them with Mono’s store, which should resolve the TLS support error.

• Tweak your connection string to enforce TLS
  Sometimes explicitly specifying TLS settings helps ensure Mono uses the right protocol. Update your connection string to include encryption and TLS version details:

  var connectionString="Server=192.10.10.211,1433;Initial Catalog=mobile;user=usr;pwd=pwd;Encrypt=True;SslProtocol=TLS1.2";
  

  This forces the connection to use TLS 1.2, which is widely supported by modern SQL Server instances.

• Ensure you’re using a recent Mono version
  Older versions of Mono had limited TLS support. If the above steps don’t work, install the latest stable release of Mono—this often fixes compatibility issues with newer TLS protocols.

After completing these steps, restart your application and test the connection again. This should resolve the "TLS Support is not available" error you’re seeing.

内容的提问来源于stack exchange，提问作者Beatles1692