Cert export error - Missing stored keyset

I'm trying to follow the instructions in the following KB article but I'm getting an error when running the PowerShell script.

https://portal.smartertools.com/kb/a3466/securing-smartermail-with-lets-encrypt.aspx

Here's the output I'm getting, any idea what could be wrong?

C:\SmarterMail\Scripts>Powershell.exe -executionpolicy remotesigned -File c:\SmarterMail\Scripts\exportcert.ps1

MY "Personal"

================ Certificate 3 ================

Serial Number: 03845e7355773d78bf1b387ff517961675fd

Issuer: CN=R3, O=Let's Encrypt, C=US

NotBefore: 6/15/2022 4:28 PM

NotAfter: 9/13/2022 4:28 PM

Subject: CN=mail.example.com

Non-root Certificate

Cert Hash(sha1): 2ff9e40474671c2f9a42409076ef6177f5c39902

Key Container = {D04742A0-C916-4AD3-B3FE-7A0B596A41F0}

Provider = Microsoft Enhanced Cryptographic Provider v1.0

Missing stored keyset

================ Begin force NCrypt ================

Missing stored keyset

---------------- End force NCrypt ----------------

CertUtil: -exportPFX command FAILED: 0x80090016 (-2146893802 NTE_BAD_KEYSET)

CertUtil: Keyset does not exist

Scott Wilson Replied

6/16/2022 at 10:17 AM

Marked As Answer

Turns out it's a permissions issue, you have to run it as an administrator. If you update batch file to the following it'll run as admin.

Powershell.exe -Command "& {Start-Process Powershell.exe -ArgumentList '-ExecutionPolicy Bypass -File ""%~dp0exportcert.ps1""' -Verb RunAs}"

pause

Zach Sylvester Replied

6/16/2022 at 10:48 AM

Employee Post

Hey Scott,

Thanks for letting us know the solution. We are happy that you figured this out.

Kind Regards,

Zach Sylvester System/Network Administrator SmarterTools Inc. (877) 357-6278 www.smartertools.com

Scott Wilson Replied

6/16/2022 at 12:29 PM

And if anyone is interested how to accomplish the same in a C# console app you can use the following which is how I figured out what was wrong since I'm not very proficient with PowerShell.

using System;
using System.IO;
using System.Security.Cryptography.X509Certificates;

namespace CertExporter
{
    class Program
    {
        static void Main(string[] args)
        {
            string subject = null;
            string password = null;
            string path = null;
            if (args.Length == 0)
            {
                Console.WriteLine("Enter the subject of cert to export:");
                subject = Console.ReadLine();
                Console.WriteLine("Enter a password:");
                password = Console.ReadLine();
                Console.WriteLine("Enter an output path:");
                path = Console.ReadLine();
            }
            else
            {
                subject = args[0];
                password = args[1];
                path = args[2];
            }
            using (var store = new X509Store(StoreLocation.LocalMachine))
            {
                store.Open(OpenFlags.ReadOnly);
                var cert = store.Certificates.Find(X509FindType.FindBySubjectName, subject, true)[0];
                byte[] data = cert.Export(X509ContentType.Pfx, password);
                File.WriteAllBytes(path, data);
                store.Close();
            }
        }
    }
}

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