WCF: “Failed to open System.ServiceModel.Channels.ClientReliableDuplexSessionChannel”

StackOverflow https://stackoverflow.com/questions/819871

Question

I currently have a WCF Service with a CallBack Contract (duplex), and when I use the application that makes use of it on my computer everything works fine, but when I try it from a different computer, it doesn't connect.

These problems started occurring once I switched to using this wsDualHttpBinding (for callbacks) because when I used wsHttpBinding everything worked fine.

Why is the web service not accepting requests from other computers? Is it some hosting settings that need to be modified?

As regards the logs, I am getting these:

alt text http://img17.imageshack.us/img17/4628/wcfissue.jpg

The open operation did not complete within the allotted timeout of 00:01:00. The time allotted to this operation may have been a portion of a longer timeout

Failed to open System.ServiceModel.Channels.ClientReliableDuplexSessionChannel

Faulted System.ServiceModel.Channels.ClientReliableDuplexSessionChannel

Faulted System.ServiceModel.Channels.ServiceChannel

Failed to open System.ServiceModel.Channels.ServiceChannel

The port is open on my router (both TCP and UDP) so that is not the issue.

As regards the Service Attributes, this is what I'm using:

Interface:

[ServiceContract(Name = "MusicRepo_DBAccess_Service", 
                 CallbackContract = typeof(IOnlineUsersCallback),
                 SessionMode=SessionMode.Required)]

Service:

[ServiceBehavior(
        ConcurrencyMode=ConcurrencyMode.Reentrant, 
        InstanceContextMode=InstanceContextMode.Single)]

[Update]

As regards Orion Edwards' post:

  • No Firewall
  • See point 1
  • Yes I can, because I have the port forwarded on my router
  • I'm using IIS to host the server.

The thing is, this problem started happening when I switched from wsHttpBinding (which was working fine) to wsDualHttpBinding (because I needed callbacks)

[Update]

I have now switched from wsDualHttpBinding to NetTcpBinding and for some reason, everything is working fine.

I have used this article to help me set up hosting on IIS, and thankully everything is working as expected, with callbacks.

Was it helpful?

Solution

I have now switched from wsDualHttpBinding to NetTcpBinding and for some reason, everything is working fine.

I have used this article to help me set up hosting on IIS, and thankully everything is working as expected, with callbacks.

OTHER TIPS

It would help if you posted the server and client configuration settings.

Here's a summary of how the wsDualHttpBinding works from MSDN (emphasise mine):

The WSDualHttpBinding provides the same support for Web Service protocols as the WSHttpBinding, but for use with duplex contracts. WSDualHttpBinding only supports SOAP security and requires reliable messaging. This binding requires that the client has a public URI that provides a callback endpoint for the service. This is provided by the clientBaseAddress attribute. A dual binding exposes the IP address of the client to the service. The client should use security to ensure that it only connects to services it trusts.

This binding can be used to communicate reliably through one or more SOAP intermediaries.

By default, this binding generates a runtime stack with WS-ReliableMessaging for reliability, WS-Security for message security and authentication, HTTP for message delivery, and a Text/XML message encoding.

Things to check:

  • Windows Firewall
  • Your antivirus product's firewall
  • Can you telnet into the port from a remote machine?
  • Is your "server" running under the ASP.NET development server? That will only accept requests from localhosts - you need to self-host the server using ServiceHost or host it under IIS.
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