"No default endpoint found" when starting WCF client - c#

I have a Windows Service which represents the WCF-Host and a WPF-Client-Application wich represents the WCF-Client.
The communication should be duplex so I went with WSDualHttpBinding.
At first I install and start my Service which opens a WCF connection after that I start my WPF app and I get the following error (I translated it):
No default endpoint was found to the contract
\ " WCFCloudManagerFolderWatcherService.Interfaces.IFilesDuplex \ " in the service model client configuration section
refers. This may be caused by: For the purposes of no configuration file was found
or in the client element no endpoint element was found , which corresponded to this contract .
Contracts:
IFilesDuplex-Contract:
[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples", SessionMode = SessionMode.Required,
CallbackContract = typeof(IFilesDuplexCallback))]
public interface IFilesDuplex
{
[OperationContract(IsOneWay = true)]
void Update();
}
IFilesDuplexCallback:
interface IFilesDuplexCallback
{
[OperationContract(IsOneWay = true)]
void Equals(string[] result);
}
ClientSide
CallbackHandler:
class CallbackHandler : IFilesDuplexCallback
{
public event Action<string[]> ReceivedList = delegate { };
public void Equals(string[] result)
{
this.ReceivedList(result);
}
}
The Client itself:
class FilesDuplexClient : DuplexClientBase<IFilesDuplex>, IFilesDuplex
{
public FilesDuplexClient(InstanceContext callbackCntx)
: base(callbackCntx)
{
}
public void Update()
{
base.Channel.Update();
}
}
And the Code from the Main Window, where the error is thrown:
CallbackHandler ch = new CallbackHandler();
ch.ReceivedList += ch_ReceivedList;
// Construct InstanceContext to handle messages on callback interface
InstanceContext instanceContext = new InstanceContext(ch);
// Create a client
FilesDuplexClient client = new FilesDuplexClient(instanceContext);
client.Update();
Serverside (Windows Service)
FileProtocoll-Class (Server code)
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
public class FileProtocoll : IFilesDuplex
{
IFilesDuplexCallback Callback
{ get { return OperationContext.Current.GetCallbackChannel<IFilesDuplexCallback>(); } }
void IFilesDuplex.Update()
{
//....
Callback.Equals(null);// just a dummy
//...
}
}
Code in the OnStart-Method (in a Thread):
// Step 1 Create a URI to serve as the base address.
Uri baseAddress = new Uri("http://localhost:8899/CloudManager/CommunicationChannel1");
// Step 2 Create a ServiceHost instance
if (selfHost != null)
{
selfHost.Close();
}
selfHost = new ServiceHost(typeof(FileProtocoll), baseAddress);
try
{
// Step 5 Start the service.
selfHost.Open();
}
catch (CommunicationException ce)
{
selfHost.Abort();
}
Code in the OnStop-Method (in a Thread):
if (selfHost != null)
{
if (selfHost.State != CommunicationState.Closed)
{
selfHost.Close();
}
selfHost = null;
}
App.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
</startup>
<system.serviceModel>
<services >
<service behaviorConfiguration="ServiceBehavior"
name="WCFCloudManagerFolderWatcherService.Communication.FileProtocoll">
<endpoint address="http://localhost:8899/CloudManager /CommunicationChannel1"
binding="wsDualHttpBinding" contract="WCFCloudManagerFolderWatcherService.Interfaces.IFilesDuplex">
<identity>
<dns value="localhost"/>
</identity>
</endpoint>
<endpoint address="mex"
binding="mexHttpBinding" contract="IMetadataExchange"/>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="ServiceBehavior">
<serviceMetadata httpGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="true "/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
</configuration>

I finally got it.
Had to make a few changes to my Client app.config and had to turn off security.
app.config(client):
<!-- WCF Client information-->
<system.serviceModel>
<bindings>
<wsDualHttpBinding>
<binding name="WSDualHttpBinding_IFilesDuplex">
<security mode="None"/>
</binding>
</wsDualHttpBinding>
</bindings>
<client>
<endpoint
address="http://localhost:8899/CloudManager/CommunicationChannel1"
binding="wsDualHttpBinding"
bindingConfiguration="WSDualHttpBinding_IFilesDuplex"
contract="WCFCloudManagerFolderWatcherService.Interfaces.IFilesDuplex"
name="WSDualHttpBinding_IFilesDuplex">
<identity>
<userPrincipalName value="localhost"/>
</identity>
</endpoint>
</client>
and in the app.config for the serverside I also hat to set
<security mode="None"/>
Now the connection works.

Related

WCF service named pipe failure

I've searched thoroughly, and found several answers to this problem, but none of them apply.
I have a .NET 4.0 WCF service hosted by windows services using a named pipe endpoint. This is set to start automatically on boot. I have a client that consumes the service.
When the server is rebooted, the service will start normally, but the client will get the following error:
1: There was no endpoint listening at net.pipe://localhost/WCFSQLService/ that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.
2: The pipe endpoint 'net.pipe://localhost/WCFSQLService/' could not be found on your local machine.
If the client and service are both restarted, the problem resolves itself.
As others have pointed out, both the Net.Pipe Listener Adapter is running and the WCF Non-HTTP Activation is checked:
We've even tried setting the service to delayed start, but no joy. One would assume it was something wrong with the endpoint or config or normal WCF stuff, but when the service and client are both restarted everything works. Additionally, this only happens on 1 machine. If necessary I can provide endpoint information and code.
Client:
NetNamedPipeBinding binding = new NetNamedPipeBinding();
EndpointAddress endpoint = new EndpointAddress(endpointAddress);
ChannelFactory<IWCFSQLService> channel = new ChannelFactory<IWCFSQLService>(binding, endpoint);
IWCFSQLService client = channel.CreateChannel();
// do client calls
channel.Close();
Host
class Program
{
static void Main(string[] args)
{
ServiceBase[] servicesToRun = new ServiceBase[]
{
new WinServiceHost(),
};
ServiceBase.Run(servicesToRun);
}
}
public class WinServiceHost : ServiceBase
{
private readonly ServiceManager serviceManager = new ServiceManager();
protected override void OnStart(string[] args)
{
base.OnStart(args);
serviceManager.OpenHost<MyService>();
}
protected override void OnStop()
{
base.OnStop();
serviceManager.CloseAll();
}
}
public class ServiceManager
{
private readonly List<ServiceHost> serviceHosts = new List<ServiceHost>();
public void CloseAll()
{
foreach (ServiceHost serviceHost in serviceHosts)
{
serviceHost.Close();
}
}
public void OpenHost<T>()
{
Type type = typeof(T);
ServiceHost serviceHost = new ServiceHost(type);
serviceHost.Open();
serviceHosts.Add(serviceHost);
}
}
config
<system.serviceModel>
<services>
<service behaviorConfiguration="behaviorConfig" name="MyService">
<endpoint address="" binding="netNamedPipeBinding" bindingConfiguration="clientNamedPipeBinding"
contract="IMyService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<host>
<baseAddresses>
<add baseAddress="net.pipe://localhost/MyService" />
</baseAddresses>
</host>
</service>
</services>
<bindings>
<netNamedPipeBinding>
<binding name="clientNamedPipeBinding">
<readerQuotas maxArrayLength="65536" maxBytesPerRead="65536" />
</binding>
</netNamedPipeBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="behaviorConfig">
<serviceMetadata httpGetEnabled="false" httpGetUrl="" />
<serviceDebug includeExceptionDetailInFaults="true" />
<serviceSecurityAudit auditLogLocation="Application" suppressAuditFailure="true" serviceAuthorizationAuditLevel="Failure" messageAuthenticationAuditLevel="SuccessOrFailure" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
Maybe the server is killing the named pipe? Try to re-open the channel on the client periodically until it recovers maybe.

function called twice with WCF

I am using a DuplexChannelFactory to connect my client to my server and what I want to do now is connect the server to each client that will register on the server. But every time I launch a client, my "init()" function is ran twice. And my DuplexChannelFactory on the server side doesn't work.
Here is how I open my server for clients :
host = new ServiceHost(typeof(NewServeur.NewServeur));
host.Open();
with its App.Config :
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="MEX">
<serviceMetadata />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="MEX" name="NewServeur.NewServeur">
<endpoint address="IProxyNewServeur" binding="netTcpBinding"
bindingConfiguration="configWin" name="NetTcpEndpoint" contract="ProxyNewServeur.IProxyNewServeur" />
<endpoint address="MEX" binding="mexTcpBinding" bindingConfiguration=""
name="MexTcpEndpoint" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="net.tcp://192.156.142.176:8080/" />
</baseAddresses>
</host>
</service>
</services>
<bindings>
<netTcpBinding>
<binding name="configWin">
<security mode="None"></security>
</binding>
</netTcpBinding>
</bindings>
</system.serviceModel>
Here is how I connect my client to my server :
void init()
{
ServiceCablingCallback ServiceCablingCallback = new ServiceCablingCallback();
ServiceCablingCallback.ClientNotified += ServiceCablingCallback_ClientNotified;
this._instanceContext = new InstanceContext(ServiceCablingCallback);
this.factory = new DuplexChannelFactory<ProxyNewServeur.IProxyNewServeur>(_instanceContext, "configClient");
this._serviceCablingClient = factory.CreateChannel();
this._clientId = _serviceCablingClient.Subscribe();
}
with its App.Config
<system.serviceModel>
<client>
<endpoint address="net.tcp://192.156.142.176:8080/IProxyNewServeur"
binding="netTcpBinding" bindingConfiguration="configWin" contract="ALSTEF.Cabling.ProxyNewServeur.IProxyNewServeur"
name="configClient" />
</client>
<bindings>
<netTcpBinding>
<binding name="configWin">
<security mode="None" />
</binding>
</netTcpBinding>
</bindings>
This works fine, but now I want to do the reverse thing, meaning connecting the server to the client. In order to do so, I added those lines before the last line of my client :
host = new ServiceHost(typeof(Service), new Uri(_serviceCablingClient.getIp()));
host.Open();
with getIp() returning the Ip address + the port 4242 of my client.
and this to the client App.config
<behaviors>
<serviceBehaviors>
<behavior name="MEX">
<serviceMetadata />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="MEX" name="Client.Model.Service">
<endpoint address="IClientFunction" binding="netTcpBinding" bindingConfiguration="ClientConfig"
name="NetTcpEndpoint" contract="ProxyNewServeur.IClientFunction" />
<endpoint address="MEX" binding="mexTcpBinding" bindingConfiguration=""
name="MexTcpEndpoint" contract="IMetadataExchange" />
</service>
</services>
<!-- in the bindings html tag -->
<binding name="ClientConfig">
<security mode="None" />
</binding>
And I modified the _serviceCablingClient.Subscribe() by adding those lines (so in the server)
public Guid Subscribe()
{
ProxyNewServeur.INewServeurCallback callback =
OperationContext.Current.GetCallbackChannel<ProxyNewServeur.INewServeurCallback>();
System.ServiceModel.Channels.RemoteEndpointMessageProperty endpointProperty =
OperationContext.Current.IncomingMessageProperties[System.ServiceModel.Channels.RemoteEndpointMessageProperty.Name] as System.ServiceModel.Channels.RemoteEndpointMessageProperty;
Guid clientId = Guid.NewGuid();
if (callback != null)
{
lock (clientsCallback)
{
clientsCallback.Add(clientId, callback);
}
}
/* code I added */
string addr = "net.tcp://" + endpointProperty.Address + ":" + "4242" + "/IClientFunction";
ClientCallback cb = new ClientCallback();
var Okvp = new KeyValuePair<Guid, DuplexChannelFactory<ProxyNewServeur.IClientFunction>>(clientId,
new DuplexChannelFactory<ProxyNewServeur.IClientFunction>(new InstanceContext(cb), "configServer",
new EndpointAddress(addr)));
this.DictClient.Add(Okvp, Okvp.Value.CreateChannel());
this.DictClient[Okvp].CreateCallbackChannel();
/* end code I added */
}
And I added this to the server App.config
<client>
<endpoint binding="netTcpBinding" bindingConfiguration="ClientConfig" contract="ProxyNewServeur.IClientFunction" name="configServer" />
</client>
<!-- in the bindings html tag -->
<binding name="ClientConfig">
<security mode="None" />
</binding>
Here is how I define my ProxyServeur file
namespace ProxyNewServeur
{
[ServiceContract(CallbackContract = typeof(INewServeurCallback))]
public interface IProxyNewServeur
{
[OperationContract]
Guid Subscribe();
[OperationContract]
string getIp();
}
[ServiceContract]
public interface INewServeurCallback
{
[OperationContract(IsOneWay = true)]
void HandleMessage(Message message);
}
[ServiceContract(CallbackContract = typeof(IClientCallback))]
public interface IClientFunction
{
[OperationContract(IsOneWay = true)]
void CreateCallbackChannel();
}
[ServiceContract]
public interface IClientCallback
{
[OperationContract(IsOneWay = true)]
void BroadcastToServer(bool isActive, Guid ClientId);
}
}
Now When I launch a client the line
DictClient[Okvp].CreateCallbackChannel();
won't work and I will go twice in the
init()
{ /* code*/
}
function.
I have no idea why this is happening. I did the exact same thing in a test project and it worked fine.
EDIT
As it turns out, you cannot have a DuplexChannelFactory<> and a ServiceHost in the same method. So what I did is that I added a new Class "DoubleConnection" that have only one attribute.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Multiple)]
public class DoubleConnection : ProxyNewServeur.IClientFunction
{
public ServiceHost host;
public void CreateCallbackChannel()
{}
public void isActive()
{}
}
and in the init() function I removed
host = new ServiceHost(typeof(Service), new Uri(_serviceCablingClient.getIp()));
host.Open();
and added
varClass = new DoubleConnection();
varClass.host = new ServiceHost(typeof(DoubleConnection), new Uri(_serviceCablingClient.getIp()));
varClass.host.Open();
I works fine now but I still don't know why you cannot have a DuplexChannelFactory<> and a ServiceHost in the same method.

WCF Service- The protocol 'https' is not supported

I am developing a WCF service using WsHttpBinding and an SSL certificate for security. Works perfectly in my local IIS, but when I publish I get the following error message;
The protocol 'https' is not supported.
Here is my web.config file..
<system.serviceModel>
<services>
<service name="PeopleService.Service.PeopleService">
<host>
<baseAddresses>
<add baseAddress="https://www.mywebsite.com/service/"/>
</baseAddresses>
</host>
<endpoint address="" binding="wsHttpBinding" bindingConfiguration="BasicBinding" contract="PeopleService.Service.IPeopleService" name="BasicEndpoint"/>
</service>
</services>
<bindings>
<wsHttpBinding>
<binding name="BasicBinding">
<security mode="TransportWithMessageCredential">
<message clientCredentialType="UserName"/>
</security>
</binding>
</wsHttpBinding>
</bindings>
I am using a ServiceHost factory to add my endpoints, so that I can load the SSL certificate from a physical file rather than from the certificate store.
public class PeopleServiceHost : ServiceHost
{
public PeopleServiceHost(params Uri[] addresses) : base(typeof(PeopleService), addresses)
{
}
protected override void InitializeRuntime()
{
Description.Behaviors.Find<ServiceDebugBehavior>().IncludeExceptionDetailInFaults = true;
Description.Behaviors.Find<ServiceDebugBehavior>().HttpsHelpPageUrl = new Uri("https://www.mywebsite.com/service/PeopleService.svc/mex");
ServiceMetadataBehavior metadataBehavior = new ServiceMetadataBehavior();
metadataBehavior.HttpsGetEnabled = true;
metadataBehavior.HttpsGetUrl = new Uri("https://www.mywebsite.com/service/PeopleService.svc/mex");
Description.Behaviors.Add(metadataBehavior);
var serviceCredentials = new ServiceCredentials();
serviceCredentials.ServiceCertificate.Certificate = new X509Certificate2(AppDomain.CurrentDomain.BaseDirectory + "\\mywebsite.pfx", "password123", X509KeyStorageFlags.MachineKeySet);
Description.Behaviors.Remove((typeof(ServiceCredentials)));
Description.Behaviors.Add(serviceCredentials);
base.InitializeRuntime();
}
}
I've been trying to solve this problem for days, but to no avail. I've contacted by host and they have advised me that HTTPS is definitely supported and enabled in IIS.
Any help is really appreciated. Thanks.

How to make a WCF Service work with https?

I am trying to enable https in my WCF service. I've added the SSL certificate to my localhost and I am able to view the WSDL when I use https in the browser. And the WCF service works fine with http without the SSL configuration in the web.config. But as soon as I change it to use https, I get the following error. If anybody can point me to the solution for this issue, it will be helpful as there isn't much reference for this error.
at Microsoft.Http.HttpStageProcessingAsyncResult.Complete(HttpStage stage, Exception e)
at Microsoft.Http.HttpStageProcessingAsyncResult.NextRequest(HttpStageProcessingAsyncResult self)
at Microsoft.Http.HttpStageProcessingAsyncResult..ctor(HttpStageProcessingAsyncState state, AsyncCallback callback, Object user)
at Microsoft.Http.HttpClient.Send(HttpRequestMessage request)
at Microsoft.Http.HttpClient.Send(HttpMethod method, Uri uri, RequestHeaders headers, HttpContent content)
at Microsoft.Http.HttpClient.Send(HttpMethod method, Uri uri)
at Microsoft.Http.HttpMethodExtensions.Method(HttpClient client, HttpMethod method, Uri uri)
at Microsoft.Http.HttpMethodExtensions.Method(HttpClient client, HttpMethod method, String uri)
at Microsoft.Http.HttpMethodExtensions.Get(HttpClient client, String uri)
at MobileScreening.Client.CommonTests.LoginPost(HttpClient client, String username, String password) in c:\TFS Projects\MobileScreening\MobileScreening.Client\CommonTests.cs:line 118
My client code where I am making the request to the service
static string LoginPost(HttpClient client, string username, string password)
{
string key = string.Empty;
try
{
var user = new UserCredentials
{
Email = username,
Password = password
};
Console.WriteLine("User Authentication:");
HttpContent content = HttpContentExtensions.CreateJsonDataContract(user);
using (HttpResponseMessage response = client.Post("AuthenticationService.svc/", content))
{
Console.WriteLine(response.Content.ReadAsString());
Console.WriteLine(response.Headers.ToString());
key = response.Headers["MobileScreening"] ?? string.Empty;
}
}
catch (Exception ex)
{
var stack = ex.StackTrace;
var innerException = ex.InnerException;
var message = ex.Message;
}
return key;
}
My interface with the operation contract
public interface IAuthenticationService
{
[OperationContract]
[WebInvoke(Method = "POST", UriTemplate = "", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
AuthenticationWrapper Authenticate(UserCredentials user);
}
My Service to authenticate users:
public class AuthenticationService : IAuthenticationService
{
public AuthenticationWrapper Authenticate(UserCredentials user)
{
string email = user.Email ?? string.Empty;
string password = user.Password ?? string.Empty;
var authentication = new Authentication();
var authenticationWrapper = new AuthenticationWrapper();
if (!authentication.AuthenticateUser(email, password))
{
const string description = "Authentication failed. Username and/or password is incorrect.";
BLL.Authentication.ThrowAuthorisationFailed(description, email);
WebOperationContext ctx = WebOperationContext.Current;
ctx.OutgoingResponse.StatusCode = HttpStatusCode.Unauthorized;
authenticationWrapper.Code = (short)HttpStatusCode.Unauthorized;
authenticationWrapper.Status = HttpStatusCode.Unauthorized.ToString();
authenticationWrapper.Message = description;
return authenticationWrapper;
}
else
{
const string description = "Authentication: Authenticate User";
LogHandler.LogMessage(email, description, Common.Event.LoginSuccessful);
string authorisationKey = authentication.CreateAuthorisationKey(email);
WebOperationContext ctx = WebOperationContext.Current;
ctx.OutgoingResponse.Headers.Add(Common.AuthorisationHeader, authorisationKey);
ctx.OutgoingResponse.StatusCode = HttpStatusCode.OK;
authenticationWrapper.Code = (short)HttpStatusCode.OK;
authenticationWrapper.Status = HttpStatusCode.OK.ToString();
authenticationWrapper.Message = description;
return authenticationWrapper;
}
}
}
Finally my web.config configuration for the service
<system.serviceModel>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"
multipleSiteBindingsEnabled="true" />
<services>
<service name="MobileScreening.ServiceApp.AuthenticationService">
<endpoint address="AuthenticationService" binding="basicHttpBinding" bindingConfiguration="secureHttpBinding" contract="MobileScreening.ServiceApp.IAuthenticationService" />
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />
</service>
<service name="MobileScreening.ServiceApp.ProgrammeService">
<endpoint address="ProgrammeService" binding="basicHttpBinding" bindingConfiguration="secureHttpBinding" contract="MobileScreening.ServiceApp.IProgrammeService" />
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />
</service>
<service name="MobileScreening.ServiceApp.ActivityService">
<endpoint address="ActivityService" binding="basicHttpBinding" bindingConfiguration="secureHttpBinding" contract="MobileScreening.ServiceApp.IActivityService" />
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />
</service>
<service name="MobileScreening.ServiceApp.UserConfigurationService">
<endpoint address="UserConfigurationService" binding="basicHttpBinding" bindingConfiguration="secureHttpBinding" contract="MobileScreening.ServiceApp.IUserConfigurationService" />
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />
</service>
</services>
<bindings>
<basicHttpBinding>
<binding name="secureHttpBinding">
<security mode="Transport">
<transport clientCredentialType="Basic"/>
</security>
</binding>
</basicHttpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpsGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
Create a new self signed certificate using your machine name instead of the local host. Configure your solution to use the new certificate and make sure that it is installed in the client machine's under the Trusted Root Certification Authority (in your case, the client is also the server).
Also, you may also try to create the certificate pointing to the machine's fully qualified domain name.

In WCF While Debugging a service, Metadata Exchange error occurs

I am trying to implement WCF Duplex Application with wsDualHttpBinding.
I am following steps given at below link:
Duplex WCF Services
When I run the service it shows "Metadata Exchange Error"
I am attaching my code here.
Kindly Help.
[1] Service1.svc
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using System.Data;
namespace WCFDuplex
{
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
public class CalculatorService : ICalculatorDuplex
{
double result;
string equation;
ICalculatorDuplexCallback callback = null;
public CalculatorService()
{
result = 0.0D;
equation = result.ToString();
callback = OperationContext.Current.GetCallbackChannel<ICalculatorDuplexCallback>();
}
public void Clear()
{
callback.Equation(equation + "=" + result.ToString());
result = 0.0D;
equation = result.ToString();
}
public void AddTo(double n)
{
result += n;
equation += " + " + n.ToString();
callback.Equals(result);
}
public void SubtractFrom(double n)
{
result -= n;
equation += " + " + n.ToString();
callback.Equals(result);
}
public void MultiplyBy(double n)
{
result *= n;
equation += " * " + n.ToString();
callback.Equals(result);
}
public void DivideBy(double n)
{
result /= n;
equation += " / " + n.ToString();
callback.Equals(result);
}
}
}
[2] IService.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WCFDuplex
{
[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples" , SessionMode = SessionMode.Required, CallbackContract = typeof(ICalculatorDuplexCallback))]
public interface ICalculatorDuplex
{
[OperationContract(IsOneWay = true)]
void Clear();
[OperationContract(IsOneWay = true)]
void AddTo(double n);
[OperationContract(IsOneWay = true)]
void SubtractFrom(double n);
[OperationContract(IsOneWay = true)]
void MultiplyBy(double n);
[OperationContract(IsOneWay = true)]
void DivideBy(double n);
}
// Use a data contract as illustrated in the sample below to add composite types to service operations.
public interface ICalculatorDuplexCallback
{
[OperationContract(IsOneWay = true)]
void Equals(double result);
[OperationContract(IsOneWay = true)]
void Equation(string eqn);
}
}
[3] Web.config
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5"/>
</system.web>
<system.serviceModel>
<services>
<service behaviorConfiguration="CalculatorServiceBehavior" name="WCFDuplex.CalculatorService">
<endpoint address="" binding="wsDualHttpBinding" contract="WCFDuplex.ICalculatorDuplex"/>
<endpoint address="mex" binding="netTcpBinding" contract="IMetadataExchange"/>
<host>
<baseAddresses>
<add baseAddress="http://localhost:12029/Service1.svc"/>
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="CalculatorServiceBehavior">
<serviceMetadata httpGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<protocolMapping>
<add binding="wsDualHttpBinding" scheme="https" />
</protocolMapping>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
<!--
To browse web app root directory during debugging, set the value below to true.
Set to false before deployment to avoid disclosing web app folder information.
-->
<directoryBrowse enabled="true"/>
</system.webServer>
</configuration>
1) in your web.config you have your meta endpoint using the wrong binding. Change it from netTcpBinding to mexHttpBinding
<service behaviorConfiguration="CalculatorServiceBehavior" name="WCFDuplex.CalculatorService">
<endpoint address="" binding="wsDualHttpBinding" contract="WCFDuplex.ICalculatorDuplex"/>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
<host>
<baseAddresses>
<add baseAddress="http://localhost:12029/Service1.svc"/>
</baseAddresses>
</host>
</service>
2) you have your schema set to https:// but you appear to be using it over http:// Change your schema to http://
<protocolMapping>
<add binding="wsDualHttpBinding" scheme="http" />
</protocolMapping>
Remove the MEX endpoint. Mex endpoints require anonymous authentication to be enabled.
<services>
<service behaviorConfiguration="CalculatorServiceBehavior" name="WCFDuplex.CalculatorService">
<endpoint address="" binding="wsDualHttpBinding"
contract="WCFDuplex.ICalculatorDuplex"/> </endpoint>
</service> </services>
if still the problem persist then please check What is the identity of IIS app pool you are using? The identity need has permission to access %windir%\temp directory. Otherwise you are unable to retrieve metadata information.

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