Why does Process.Start throw Win32Exception if using different user credentials?

I need to start a process as another user and it's bombing.

I scaled it down my code to a simple reference example. This code works fine to start the process itself:

        var i开发者_运维知识库nfo = new ProcessStartInfo("notepad.exe")
                       {
                           UseShellExecute = false,
                           RedirectStandardInput = true,
                           RedirectStandardError = true,
                           RedirectStandardOutput = true
                       };

However, if I add the UserName and Password values:

       var info = new ProcessStartInfo("notepad.exe")
                       {
                           UserName = "user",
                           Password = StringToSecureString("password"),
                           UseShellExecute = false,
                           RedirectStandardInput = true,
                           RedirectStandardError = true,
                           RedirectStandardOutput = true
                       };
        Process.Start(info);

It bombs with the ever so helpful System.ComponentModel.Win32Exception message:

The service cannot be started, either because it is disabled or because it has no enabled devices associated with it.

Just in case, here is the secure string conversion method:

    private static SecureString StringToSecureString(string s)
    {
        var secure = new SecureString();
        foreach (var c in s.ToCharArray())
        {
            secure.AppendChar(c);
        }
        return secure;
    }

Any ideas or alternate solutions would be very much appreciated!

Is your Secondary Logon service started, I believe this is required to start a new process under a different user account?

I think you are probably missing the Domain property on the ProcessStartInfo.

Compare your code to the example given in the docs:

Imports System
Imports System.ComponentModel
Imports System.Diagnostics
Imports System.Security

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Security;

public class Example
{
    public static void Main()
    {
        // Instantiate the secure string.
        SecureString securePwd = new SecureString();
        ConsoleKeyInfo key;

        Console.Write("Enter password: ");
        do {
           key = Console.ReadKey(true);

           // Ignore any key out of range.
           if (((int) key.Key) >= 65 && ((int) key.Key <= 90)) {
              // Append the character to the password.
              securePwd.AppendChar(key.KeyChar);
              Console.Write("*");
           }   
        // Exit if Enter key is pressed.
        } while (key.Key != ConsoleKey.Enter);
        Console.WriteLine();

        try
        {
            Process.Start("Notepad.exe", "MyUser", securePwd, "MYDOMAIN");
        }
        catch (Win32Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
}