Escribimos un código hace mucho tiempo para llamar a un servicio con credenciales de dominio. Ahora se cambian los dominios y se planea usar la cuenta predeterminada de Windows

Así que estoy tratando de restablecer las credenciales de red para un servicio web asmx a través de config. Creé una clase SoapExtentsion e intenté anular allí, incluso ejecuta la línea. Pero nunca se aplica y siempre gana el siguiente código existente

Código actual

EmployeeService prxy = new EmployeeService();
prxy.Credentials = new System.Net.NetworkCredential("MyAccount", "pwd", "MyDomain");
 //prxy.UseDefaultCredentials = true;// It works but we dont want code change
prxy.GetEmployee(empId);

Nuevo código / cambio de configuración solamente

Planeando inyectar a través de dll adicionales y cambios de configuración. Entonces, el cambio de código en el código original anterior no es obligatorio / está prohibido ahora

public class WindowsDefCredSoapExtn : SoapExtension
{
    public override object GetInitializer(Type serviceType)
    {
        return "";
    }

    public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute)
    {
        return "";
    }

    public override void Initialize(object initializer)
    {
        //throw new NotImplementedException();
    }

    public override void ProcessMessage(SoapMessage message)
    {

      if (message is SoapClientMessage)
          {
          if (message.Stage == SoapMessageStage.BeforeSerialize)
              {                             
              ((SoapClientMessage)message).Client.Credentials=null;
              (((SoapClientMessage)message)).Client.UseDefaultCredentials = true;

              }
          }                

        }

    }
}


 <system.web>
    <webServices>
      <soapExtensionTypes>
        <add type="MyAssembly.WindowsDefCredSoapExtn, MyAssembly" priority="1" group="Low"/>
      </soapExtensionTypes>
    </webServices>
  </system.web>

¿Alguien sabe cómo cambiar dinámicamente las credenciales de red utilizadas para un servicio ASMX a través de la configuración?

ACTUALIZAR:

Durante la depuración, pude ver que las credenciales de red se restablecen. Pero de alguna manera se envía al servidor cuando se invoca la solicitud.

EmployeeService prxy = new EmployeeService();
prxy.Credentials = new System.Net.NetworkCredential("MyAccount", "pwd", "MyDomain");
 //while debug, prxy.UseDefaultCredentials= false here
//My soap extension gets executed and resets credentials.
prxy.GetEmployee(empId);
 //while debug, prxy.UseDefaultCredentials= true here
 //while debug prxy.Credentials are null here. 

Ventana de salida:

Ver la última línea AcquireCredentialsHandle pasesauthdata. Las credenciales que se establecen enprxy.Credentials = new System.Net.NetworkCredential("MyAccount", "pwd", "MyDomain") siendo utilizado aunque mi extensión de servicio se reinicie.

System.Net Verbose: 0 : [11584] WebRequest::Create(http://employee-service/empService.asmx)
System.Net Verbose: 0 : [11584] HttpWebRequest#39256744::HttpWebRequest(http://employee-service/empService.asmx#173042156)
System.Net Information: 0 : [11584] RAS supported: True
System.Net Verbose: 0 : [11584] Exiting HttpWebRequest#39256744::HttpWebRequest() 
System.Net Verbose: 0 : [11584] Exiting WebRequest::Create()    -> HttpWebRequest#39256744
System.Net Verbose: 0 : [11584] HttpWebRequest#39256744::GetRequestStream()
System.Net Information: 0 : [11584] Associating HttpWebRequest#39256744 with ServicePoint#19085264
System.Net Information: 0 : [11584] Associating Connection#65246235 with HttpWebRequest#39256744
System.Net.Sockets Verbose: 0 : [11584] Socket#27993665::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [11584] Exiting Socket#27993665::Socket() 
System.Net.Sockets Verbose: 0 : [11584] Socket#27993665::Connect(45:80#763949146)
System.Net.Sockets Information: 0 : [11584] Socket#27993665 - Created connection from 10.234.80.99:48954 to 10.242.137.45:80
System.Net Information: 0 : [11584] HttpWebRequest#39256744 - Request: POST /empService.asmx HTTP/1.1

System.Net.Sockets Verbose: 0 : [11584] Socket#27993665::Send()
System.Net.Sockets Verbose: 0 : [11584] Data from Socket#27993665::Send
System.Net.Sockets Verbose: 0 : [11584] <<POST /empService.asmx HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 4.0.30319.2034)

System.Net.Sockets Verbose: 0 : [11584] Exiting Socket#27993665::Send()     -> 512#512
System.Net Information: 0 : [11584] ConnectStream#50996063 - Sending headers
{
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 4.0.30319.2034)
VsDebuggerCausalityData: uIDPo3GOBVodvqZLgUWyCSNWI5kAAAAAzHBQpKvNJ0SvKGwy+a3tGerbsJdijWdHqs2PJipnfqYACQAA
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://employee-service/GetProperties"
Host: employee-service
Content-Length: 507
Expect: 100-continue
Connection: Keep-Alive
}.
System.Net.Sockets Verbose: 0 : [11584] Socket#27993665::Receive()
System.Net.Sockets Verbose: 0 : [11584] Data from Socket#27993665::Receive
System.Net.Sockets Verbose: 0 : [11584] <<HTTP/1.1 401 Unauthorized
Content-Length: 0
WWW-Authenticate: NTLM
Date: Fri, 08 Jul 2016 16:11:15 GMT

>>
System.Net.Sockets Verbose: 0 : [11584] Exiting Socket#27993665::Receive()  -> 109#109
System.Net Information: 0 : [11584] Connection#65246235 - Received status line: Version=1.1, StatusCode=401, StatusDescription=Unauthorized.
System.Net Information: 0 : [11584] Connection#65246235 - Received headers
{
Content-Length: 0
Date: Fri, 08 Jul 2016 16:11:15 GMT
WWW-Authenticate: NTLM
}.
System.Net Information: 0 : [11584] ConnectStream#7794715::ConnectStream(Buffered 0 bytes.)
System.Net.Sockets Verbose: 0 : [11584] Socket#27993665::MultipleSend()
System.Net.Sockets Verbose: 0 : [11584] Exiting Socket#27993665::MultipleSend() 
System.Net Verbose: 0 : [11584] Data from ConnectStream#50996063::ResubmitWrite

System.Net Information: 0 : [11584] Associating HttpWebRequest#39256744 with ConnectStream#7794715
System.Net Information: 0 : [11584] Associating HttpWebRequest#39256744 with HttpWebResponse#29471296
System.Net Information: 0 : [11584] Enumerating security packages:
System.Net Information: 0 : [11584]     Negotiate
System.Net Information: 0 : [11584]     Kerberos
System.Net Information: 0 : [11584]     NTLM
System.Net Information: 0 : [11584]     Microsoft Unified Security Protocol Provider
System.Net Information: 0 : [11584]     Schannel
System.Net Information: 0 : [11584]     WDigest
System.Net Information: 0 : [11584]     DPA
System.Net Information: 0 : [11584]     Digest
System.Net Information: 0 : [11584]     MSN
System.Net Information: 0 : [11584] AcquireCredentialsHandle(package  = NTLM, intent   = Outbound, authdata = MyDomain\MyAccount)

ACTUALIZACIÓN 2

Acabo de hacer un cambio de código para probar y a continuación hay una diferencia en la comunicación del socket

AcquireDefaultCredential(package = NTLM, intent  = Outbound) 

Vs

AcquireCredentialsHandle(package  = NTLM, intent   = Outbound, authdata = MyDomain\MyAccount)