WCF, NetMsmqBinding, and “The signature is invalid”

Today I was trying to get my service to work in a test, and it used NetMsmqBinding. Here’s the initialization:

public sealed class DemoTests
{
  private static string Address;
  private static string QueueName;

  [ClassInitialize]
  public static void ClassInitialize(TestContext context)
  {
    DemoTests.QueueName = Guid.NewGuid().ToString("N");
    MessageQueue queue = MessageQueue.Create(
      @".\Private$\" + DemoTests.QueueName);
    DemoTests.Address = 
      "net.msmq://localhost/private/" + DemoTests.QueueName;
  }
}

You can assume there’s a ClassCleanup attributed method to delete the queue. Here’s the test method:

[TestMethod]
public void ManageMessage()
{
  using (ServiceHost host = new ServiceHost(typeof(DemoService)))
  {
    NetMsmqBinding binding = new NetMsmqBinding();
    binding.Durable = false;
    binding.ExactlyOnce = false;

    host.AddServiceEndpoint(typeof(IDemoService),
      binding, DemoTests.Address);
    host.Open();

    using (ChannelFactory<IDemoService> factory =
      new ChannelFactory<IDemoService>(binding,
      new EndpointAddress(DemoTests.Address)))
    {
      IDemoService channel = factory.CreateChannel();
      DemoRequest request = new DemoRequest();
      request.StringData = "Data";
      channel.Manage(request);
    }
  }
}

Now, once Manage() was invoked, I would get a message in the dead-letter messages, saying “The signature is invalid”. There was a link I found that mentioned this error, and it contains a subtle clue:

However I had failed to create the MSMQ queue with the “Authenticated” option turned off! Doh.

That means I needed to do this:

[TestMethod]
public void ManageMessage()
{
  using (ServiceHost host = new ServiceHost(typeof(DemoService)))
  {
    NetMsmqBinding binding = new NetMsmqBinding();
    binding.Durable = false;
    binding.ExactlyOnce = false;
    binding.Security.Mode = NetMsmqSecurityMode.None;

    host.AddServiceEndpoint(typeof(IDemoService),
      binding, DemoTests.Address);
    host.Open();

    using (ChannelFactory<IDemoService> factory =
      new ChannelFactory<IDemoService>(binding,
      new EndpointAddress(DemoTests.Address)))
    {
      IDemoService channel = factory.CreateChannel();
      DemoRequest request = new DemoRequest();
      request.StringData = "Data";
      channel.Manage(request);
    }
  }
}

Just turn off security! Once I did this, all was well with the world.

Published: 01.19.2007 01:22:59 PM CST

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Jason Bock

WCF, NetMsmqBinding, and “The signature is invalid”