WCF Client Can't connect to Host in same application instance

Question

I have a WPF GUI that has two buttons. Button 1 creates a new WCF Host that listens for requests via Named Pipes. Button 2 uses a Client Proxy DLL to query the Host via Named Pipes.

Clicking button 2, the Client portion is unable to connect.

If however, I run a second instance of the client and click Button 2. It can connect?

The WCF host is running fine, once the server is started. I can also query it with the WCFTestClient ... so the problem only exists within the same instance.

The excpetion thrown is.

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This request operation sent to net.pipe://localhost/SvcName did not receive a reply within the configured timeout (00:01:00). The time allotted to this operation may have been a portion of a longer timeout. This may be because the service is still processing the operation or because the service was unable to send a reply message. Please consider increasing the operation timeout (by casting the channel/proxy to IContextChannel and setting the OperationTimeout property) and ensure that the service is able to connect to the client.

Any thoughts would be greatly appreciated.

Thanks Warrick

Answer 1

Can you mark the class that implements your service with this:

[ServiceBehavior(UseSynchronizationContext = false)]

and try again.