I have a SharePoint 2016 Farm with 3 Servers. 1 SQL Server, 1 Application and 1 Web Front End Server. When trying to click on a App (under Site Contents) I get "An unexpected error has occurred" and from the ULS Logs I can see the following MEssage before the error occurs:

WcfSendRequest: RemoteAddress: 'http://XXXXX:32843/374c2c90cb10479091275218eb3fbfa1/AppMng.svc' Channel: 'Microsoft.SharePoint.AppManagement.IAppManagementServiceApplication' Action: 'http://schemas.microsoft.com/sharepoint/soap/IAppManagementServiceApplication/GetAppManagementDatabaseMap' MessageId: XXXXXXX'

And than:

 Exception returned from back end service. 
The service implementation object was not initialized or is not available. 
(Fault Detail is equal to An ExceptionDetail, likely created by 
IncludeExceptionDetailInFaults=true, whose value is: 
System.InvalidOperationException: The service implementation object was not 
initialized or is not available.   
 at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, 
Object[] inputs, Object[]& outputs)    

System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)    
 at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)    

  System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)    
     at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean 
(with IncludeExceptionDetailInFaults=true)

Now comes the strange thing: As soon as I change the webapplication to run on the Application Server, so without calling the WFE all works fine.

I have removed and added subscription settings service application, App management service application and under Service Connections all Proxys are checked.

Can someone help me?

Thanks in advance!

  • Are you using SSL? And hostheaders for your webapplications? – Christoffer Aug 22 '17 at 9:10
  • I am not using SSL. The web application is using host headers but i have also a web application without host headers on port 80... – Sebi Aug 22 '17 at 9:12
  • Allright, that's what i was asking for.. i had problems to get everything to work without that damn "Listener" webapplication without HHS on port 80 – Christoffer Aug 22 '17 at 9:16
  • Is the service application added to the webapplication proxy/service group? Go to SharePoint Central Administration -> Application Management -> Manage Web Applications, then select your Web Application, and then click in "Service Connections" and check if the related service applications are in the correct group. – Christoffer Aug 22 '17 at 9:24
  • Yes the related service applications are in the correct group and active. – Sebi Aug 22 '17 at 9:39

After a reinstall of sharepoint on the WFE all works fine again.

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