Failed to add a service Service metadata may not be accessible Make sure your service is running and exposing metadata

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EDIT   After I modified the web config and I don t get error that s good     then I add a new page  html  and write this small code to consume the service like this        btn12   click function  event                      getJSON  http   localhost 3576 MyService svc GetCurrentUser                       function  data                        alert data                                         return false                    I see the following error in my FireBug   http   localhost 3576 MyService svc GetCurrentUser 400 Bad Request   Note  I have added html page on the same wcf project and running the project it self so I am assuming the service is also running      What might be wrong here   END EDIT  I have just created a new wcf services and when I hit f5 from VS and I get this error in WCF Test Client window       Failed to add a service  Service metadata may not be accessible  Make sure your service is running and exposing metadata       Error  Cannot obtain Metadata from http   localhost 3696 MobileService svc If this is a Windows  R  Communication Foundation service to which you have access  please check that you have enabled metadata publishing at the specified address   For help enabling metadata publishing  please refer to the MSDN documentation at http   go microsoft com fwlink  LinkId 65455       WS-Metadata Exchange Error   URI  http   localhost 3696 MyService svc   Metadata contains a reference that cannot be resolved   http   localhost 3696 MyService svc            There was no endpoint listening at http   localhost 3696 MyService svc that could accept the message  This is often caused by an incorrect address or SOAP action  See InnerException  if present  for more details           Unable to connect to the remote server   No connection could be made because the target machine actively refused it 127 0 0 1 3696   HTTP GET Error   URI  http   localhost 3696 MyService svc   There was an error downloading  http   localhost 3696 MyService svc     Unable to connect to the remote server   No connection could be made because the target machine actively refused it 127 0 0 1 3696   My config      lt behaviors gt       lt endpointBehaviors gt           lt behavior name  MyService MyService  gt               lt webHttp  gt           lt  behavior gt       lt  endpointBehaviors gt       lt serviceBehaviors gt           lt behavior name  metadataBehavior  gt               lt serviceMetadata httpGetEnabled  true  httpGetUrl  http   localhost 2812 MyService svc    gt           lt  behavior gt       lt  serviceBehaviors gt   lt  behaviors gt   lt services gt       lt service name  MyService MyService                behaviorConfiguration  metadataBehavior  gt           lt endpoint              address  http   localhost MyService svc               binding  customBinding              bindingConfiguration  jsonpBinding               behaviorConfiguration  MyService MyService              contract  MyService IMyService   gt       lt  service gt   lt  services gt   lt bindings gt       lt customBinding gt           lt binding name  jsonpBinding  gt               lt jsonpMessageEncoding  gt               lt httpTransport manualAddressing  true   gt           lt  binding gt       lt  customBinding gt   lt  bindings gt   lt extensions gt       lt bindingElementExtensions gt           lt add name  jsonpMessageEncoding  type  Microsoft Ajax Samples JsonpBindingExtension  MyService  Version 1 0 0 0  Culture neutral  PublicKeyToken null   gt       lt  bindingElementExtensions gt   lt  extensions gt

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In my case I was getting this error because the option  HttpActivation  was not enabled

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For me the issue got resolved by doing the following  Navigated to Tool -- gt  Options -- gt  Project and Solutions -- gt  Web Projects I could find the first check box  quot Use the 64 bit version of IIS Express of web sites and projects quot  was unchecked  Selecting this check box helped me in launching the WCF Client  VS Version   VS2019

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changing the Binding Type from wsHttpbinding to basichttp binding in the endpoint tag and from wsHttpbinding to mexhttpbinginding in metadata endpoint tag helped to overcome the error  Thank you

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I observed that when I removed SessionMode from the ServiceContract attribute  the issue went away   Example    ServiceContract SessionMode SessionMode Required  CallbackContract typeof ICallbacks     public interface IStringReverser        OperationContract     string ReverseString string value        to      ServiceContract     public interface IStringReverser        OperationContract     string ReverseString string value

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In case you rename the svc file make sure that your markup is correct   You ll need to modify the default configuration and follow these steps  1  Go to SVC file right click and select view markup 2  Make sure that that code  behind and service pointing to correct the file and class name

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I have tried several solutions mentioned over web  unfortunately without any success  In my project  I have two interfaces xml json  for each service  Adding mex endpoints or binding configurations did not helped at all  But  I have noticed  I get this error only when running project with   svc cs or   config file focused  When I run project with IService cs file focused  where interfaces are defined   service is added without any errors  This is really strange and in my opinion conclusion is bug in Visual Studio 2013  I reproduced same behaviour on several machines even on Windows Server machine   Hope this helps someone

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You need to add a metadata exchange  mex  endpoint to your service    lt services gt      lt service name  MyService MyService  behaviorConfiguration  metadataBehavior  gt         lt endpoint            address  http   localhost MyService svc             binding  customBinding  bindingConfiguration  jsonpBinding             behaviorConfiguration  MyService MyService            contract  MyService IMyService   gt         lt endpoint            address  mex             binding  mexHttpBinding             contract  IMetadataExchange   gt      lt  service gt   lt  services gt    Now  you should be able to get metadata for your service  Update  ok  so you re just launching this from Visual Studio - in that case  it will be hosted in Cassini  the built-in web server  That beast however only supports HTTP - you re not using that protocol in your binding     Also  since you re hosting this in Cassini  the address of your service will be dictated by Cassini - you don t get to define anything    So my suggestion would be    try to use http binding  just now for testing  get this to work once you know it works  change it to your custom binding and host it in IIS   So I would change the config to    lt behaviors gt      lt serviceBehaviors gt         lt behavior name  metadataBehavior  gt            lt serviceMetadata httpGetEnabled  true    gt         lt  behavior gt      lt  serviceBehaviors gt   lt  behaviors gt   lt services gt      lt service name  MyService MyService  behaviorConfiguration  metadataBehavior  gt         lt endpoint            address       lt  -- don t put anything here - Cassini will determine address -- gt            binding  basicHttpBinding             contract  MyService IMyService   gt         lt endpoint            address  mex             binding  mexHttpBinding             contract  IMetadataExchange   gt      lt  service gt   lt  services gt    Once you have that  try to do a View in Browser on your SVC file in your Visual Studio solution - if that doesn t work  you still have a major problem of some sort    If it works - now you can press F5 in VS and your service should come up  and using the WCF Test Client app  you should be able to get your service metadata from a  the address that Cassini started your service on  or b  the mex address  Cassini s address    mex

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In Visual Studio    project properties  right click on your project  Debug -  Start Options Make sure  Command line arguments  is empty

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FYI - YOU CAN also get this error from a machine that is not having enough memory free   I got this error on a machine I run with 16 gigs of memory   I had a VM running with 6 gigs and a LOT of memory intensive apps   Close some down and this problem went away   I still did get the error in the title of the question of  Failed to add a service  Service metadata may not be accessible  Make sure your service is running and exposing metadata    I did notice a larger message about memory though in using the WCF Test Client   Hope this helps someone else

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if working with  NET 4 0 WCF service  - make sure Global asax is not in the source directory  If it is   it is picked up at runtime and attempted to be compiled in

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In my case  the Webservice was generating the assembly with a different name than the project service name  It was set like that by my predecessor developer working on the solution and I didn t know   It was set to -     lt serviceBehaviors gt       lt behavior name  CustomServiceBehavior  gt         lt serviceAuthorization serviceAuthorizationManagerType  BookingService KeyAuthorizationManager  BookingService    gt        lt  behavior gt    lt  serviceBehaviors gt    So  the fix was the put the right assembly name in serviceAuthorizationManagerType  The assembly name can be obtained from following path of the service project   Right click on the WCF svc project--  Select  Properties  --  From the list of tabs select  Application   Check the value against  Assembly name   field in the list  This is the assemblyName to use for serviceAuthorizationManagerType which may not be the servicename necessarily      lt serviceBehaviors gt       lt behavior name  MyCustomServiceBehavior  gt         lt serviceAuthorization serviceAuthorizationManagerType  BookingService KeyAuthorizationManager  AssemblyNameFromSvcProperties    gt        lt  behavior gt    lt  serviceBehaviors gt    remember to follow the instruction for serviceAuthorizationManagerType as mentioned on https   docs microsoft com en-us dotnet framework wcf extending how-to-create-a-custom-authorization-manager-for-a-service  It says -  Warning  Note that when you specify the serviceAuthorizationManagerType  the string must contain the fully qualified type name  a comma  and the name of the assembly in which the type is defined  If you leave out the assembly name  WCF will attempt to load the type from System ServiceModel dll

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Add Serializable   before the type you expose   Serializable   Public Class YourType   Put Serializable into  lt  gt

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Most of the time this happens due to less memory space  first check then try some other tricks

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After Add this to your web config file and configure according to your service name and contract name    lt behaviors gt      lt serviceBehaviors gt         lt behavior name  metadataBehavior  gt            lt serviceMetadata httpGetEnabled  true    gt         lt  behavior gt      lt  serviceBehaviors gt   lt  behaviors gt   lt services gt      lt service name  MyService MyService  behaviorConfiguration  metadataBehavior  gt         lt endpoint            address       lt  -- don t put anything here - Cassini will determine address -- gt            binding  basicHttpBinding             contract  MyService IMyService   gt         lt endpoint            address  mex             binding  mexHttpBinding             contract  IMetadataExchange   gt      lt  service gt   lt  services gt    Please add this in your Service svc  using System ServiceModel Description    Hope it will helps you

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Change to older Visual Studio  Weird solution that worked for me  I was using Visual studio 2017  after changing to Visual Studio 2015  everything worked

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In my case  on commenting out the    lt serviceMetadata httpGetEnabled  true  httpsGetEnabled  true   gt     in the web config file was throwing  Failed to add a service  Service metadata may not be accessible  Make sure your service is running and exposing metadata

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The property IsOneWay true may be true in the Operational contract of the interface  Remove that property to get rid of this error

[web-services] Failed to add a service. Service metadata may not be accessible. Make sure your service is running and exposing metadata.`

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