How do I configure distributed transactions for NServiceBus - nservicebus

Question

I have the following scenario.
First write something to a db
Send message on bus
I want to execute those like an atomic action, that is, running them in a transaction but can't get it to work when it is really distributed. Everything was working fint on local machine, but as soon as the service was on another machine it stopped working.
My code looks something like this:
using(var ts = new TransactionScope())
{
// Write something to db
_bus.Send(SomeMessage);
ts.Complete();
}
I have done everything I could think of and find information about, like enabling DTC on client, server and db with inbound and outbound enabled, set the port DCOM protocols to 5000-6000. The error I get is:
FailedToSendMessageException: "Failed to send message to address: myserver"
and the stacktrace is:
at NServiceBus.Transports.Msmq.MsmqMessageSender.ThrowFailedToSendException(Address address, Exception ex) in c:\BuildAgent\work\d4de8921a0aabf04\src\NServiceBus.Core\Transports\Msmq\MsmqMessageSender.cs:line 89
at NServiceBus.Transports.Msmq.MsmqMessageSender.Send(TransportMessage message, Address address) in c:\BuildAgent\work\d4de8921a0aabf04\src\NServiceBus.Core\Transports\Msmq\MsmqMessageSender.cs:line 80
at NServiceBus.Unicast.UnicastBus.SendMessage(List`1 addresses, String correlationId, MessageIntentEnum messageIntent, Object[] messages) in c:\BuildAgent\work\d4de8921a0aabf04\src\NServiceBus.Core\Unicast\UnicastBus.cs:line 658
at NServiceBus.Unicast.UnicastBus.SendMessage(Address address, String correlationId, MessageIntentEnum messageIntent, Object[] messages) in c:\BuildAgent\work\d4de8921a0aabf04\src\NServiceBus.Core\Unicast\UnicastBus.cs:line 583
at NServiceBus.Unicast.UnicastBus.NServiceBus.IBus.Send(Object[] messages) in c:\BuildAgent\work\d4de8921a0aabf04\src\NServiceBus.Core\Unicast\UnicastBus.cs:line 480
at Rapporteringsregisteret.Web.Controllers.RapporteringController.Post(OpprettRapportering opprettRapportering) in c:\dev\git\Rapporteringsregisteret\src\Rapporteringsregisteret.Web\Controllers\RapporteringController.cs:line 37
at lambda_method(Closure , Object , Object[] )
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
Why isn't this working?

Answer 1

When running in a distributed scenario your endpoint mapping needs to explicitely define the machine name where the queue of the receiver is located. When running on the same box this is not necessary. Therefore your mapping should not contain "myserver" but "myserver#machinename". This error is not related to DTC. For future questions always include Nservicebus version number and transport layer