Inserting Certificate (with privatekey) in Root, LocalMachine certificate store fails in .NET 4

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I had exactly the same problem and the solution turned out to be really simple.
All I had to do is to pass

X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet

to X509Certificate2’s ctor.
Now you are using the DotNetUtilities to convert the bouncycastle certificate to the .net one, but the helper method creates the .net cert with the DefaultKeySet (instead of MachineKeySet + PersistKeySet
).

And arrange the private key like this:

var cspParams = new CspParameters
{
      KeyContainerName = Guid.NewGuid().ToString(),
      KeyNumber = (int)KeyNumber.Exchange,
      Flags = CspProviderFlags.UseMachineKeyStore
};

var rsaProvider = new RSACryptoServiceProvider(cspParams);

I hope this helps.

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