Cannot connect Callback servce

Question

Environment: VS2010 Express VB
OS: Windows 7 Professional

I have written a client to communicate with a Web-Service. For this service I had to implement a Callback Service to receive the result asynchronsly .

When I execute my application, I can check my callback service with http://localhost:14098/ImportCallback and it seems to be. However,when I try to call the service with an IP address http://172.16.50.23:14098/ImportCallback, I do not get a TCP connection.

I have checked my firewall, etc

The sysinternal tool tcpview displays the following entry:

System 4 TCP 127.0.0.1 14098 0.0.0.0 0 LISTENING          

<binding name="BasicHttpBinding_IImportServiceCallback" closeTimeout="00:01:00"
            openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
            allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
            maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
            messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
            useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
              maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
                realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
          </security>
        </binding>

<ServiceBehavior(InstanceContextMode:=InstanceContextMode.Single, IncludeExceptionDetailInFaults:=True, Namespace:="http://schemas.frequentis.com/iccs/conacs/1.0")>
Public Class ConacsCallbackHost
    Implements IImportServiceCallback, IDisposable
    ' Singleton
.....
 Public Sub New(ByVal aUri As String)
        MyBase.New()
        Dim serviceAddress As Uri = New Uri(aUri)
        serviceHost = New ServiceHost(Me, serviceAddress)
        Try
            Dim binding As BasicHttpBinding = New BasicHttpBinding("BasicHttpBinding_IImportServiceCallback")
            binding.Namespace = cSchemaNamespace
            Dim metaDatabehavior As ServiceMetadataBehavior = New ServiceMetadataBehavior
            metaDatabehavior.HttpGetEnabled = vbTrue
            serviceHost.Description.Behaviors.Add(metaDatabehavior)
            serviceHost.AddServiceEndpoint( _
                GetType(IImportServiceCallback), _
                binding, _
                serviceAddress)
            serviceHost.Open()

KR

Michael

Answer 1

Hi,

What your meaning is that when you are calling the callback service with an IP address, then you cannot get a TCP connection. But I want to know What error message did you get? You can try hosting the WCF service under IIS. As for this error, maybe the firewall is blocking the request and make net.tcp listeners adapter was present.

Regards,
Peter

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Answer 2

Sorry for the delay.

I am trying to develop the client version which runs under Windows 7. The service (A) itself is using a Web Service callback, which runs on my client PC. The callback should be invoked after I have sent a request to the service A.

I am not sure what You mean with the net.tcp listener. Since I am using the WCF framework I do not have to operate with the Net.TCP framework.

However, my callback is actually running. Is it possible, that the cause for my problem may be that the service runs under 127.0.0.1?

The sysinternal tool tcpview displays the following entry:

System 4 TCP 127.0.0.1 14098 0.0.0.0 0 LISTENING       

KR

Michael

Answer 3

I could solve the problem now by myself.

The reason was that I have added IPlistener entries as described in Configuring HTTP and HTTPS.

After I have deleted the two entries I could invoke my service successfully.

netsh http delete iplisten 0.0.0.0:14098
netsh http delete iplisten 127.0.0.1:14098

KR

Michael