Why am I getting an exception (TCP error code 10061) when attempting to communicate between 2 applications using WCF?

Hi:

I am trying to use WCF to setup IPC between 2 running windows applications.
I want to start out by saying that I know there are other (better?) ways to implement
this solution. But, due to some pre-existing design considerations/constraints, I'm bound to using:
- netTcpBinding
- DuplexChannelFactory<> to support bidirectional communication

All the applications, services, etc reside on the same machine as we will be
installing everything on a single dedicated piece hardware running MS Windows.


So the schematic kind of looks like this
WPFApp1
(Contains ReportingFacilityInterface definition)
Returns notifications as separate callbacks to WPFApp2
^
|
|
V
ReportingFacilityInterfaceProxy
^
|
|
V
WPFApp2 (needs to call exposed methods on WPF1 ReportingFacilityInterface object)


I've created my WCF "service" class and contracts.
I'm using a proxy dll to facilitate the communication.


Here's the sequence of events:
-----------------------------
1)WPFApp1 starts up and instantiates an instance of the exposed service class

ReportingFacilityInterface = new ReportingFacility.ReportingFacilityInterface(); 

This starts up fine.


2) WPFApp2 startsup and initializes instance of proxy object

reportingFacilityProxy = new ReportingFacilityInterfaceProxy.ReportingFacilityProxy();

This instantiates the proxy object, which results in this getting called:

<pre>reportingFacilityInterface = DuplexChannelFactory<IReportingFacilityInterface>.CreateChannel(objContext, "RPIEndPointConfiguration"); 

This seems to run and return successfuly.


3) WPFApp2 calls a on the object (through the proxy)

reportingFacilityInterface.Initialize(configuration);

I get an exception with the following detail:

Could not connect to net.tcp://localhost:8732/ReportingFacility.
The connection attempt lasted for a time span of 00:00:02.1931255.
TCP error code 10061: No connection could be made because the target machine actively refused it 127.0.0.1:8732

I examined my current port usage using the CurrPorts application and noticed that port #8732 does is not in the list of currently active/used ports on my machine.


Since I'm pretty green @ the world of WCF, I'm kind of stumped here.
As I mentioned above, all these are running on the same (dedicated) piece of Windows 7 hardware, so permissions/roles should not be an issue.
I think I'm pretty close here, but am just missing something.

Thanks,
JohnB

Tags: C#, .NET, WCF, IPC