TF400898 error after upgrading to TFS 2015
After upgrading TFS Express 2013 to 2015 I get the following error(s):
1) When trying to go to the tfs admin page
TF400898: An Internal Error Occurred.
2) In the event log:
Web Request Details
Url: http://tfs.XXXXXX.com:8080/tfs/defaultcollection/Services/v3.0/LocationService.asmx [method: POST]
User Agent: Team Foundation (devenv.exe, 14.0.23102.0, Pro, SKU:31)
Headers: not available
Path: /tfs/defaultcollection/Services/v3.0/LocationService.asmx
Local Request: False
Host Address: 76.XXX.XXX.115
User: RR2014sweaver [authentication type: NTLM]
Exception Message: The extension '.svc' is not registered with WCF/WF handler. Please either remove relativeAddress '~/ServiceManagement.svc' in 'system.serviceModel/serviceHostingEnvironment/serviceActivations' from configuration file or register the corresponding extension '.svc' with WCF/WF handler. Please refer to 'http://msdn.microsoft.com/en-us/library/bb515343.aspx' for how to register an extension in IIS. (type ConfigurationErrorsException)
Exception Stack Trace: at System.ServiceModel.ServiceHostingEnvironment.HostingManager.NormalizedRelativeAddress(String relativeAddress)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.LoadConfigParameters()
at System.ServiceModel.ServiceHostingEnvironment.HostingManager..ctor()
at System.ServiceModel.ServiceHostingEnvironment.EnsureInitialized()
at System.ServiceModel.ServiceHostingEnvironment.OnEnsureInitialized(Object state)
at System.ServiceModel.AspNetPartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state)
at System.ServiceModel.ServiceHostingEnvironment.SafeEnsureInitialized()
at System.ServiceModel.Activation.ServiceHttpModule.BeginProcessRequest(Object sender, EventArgs e, AsyncCallback cb, Object extraData)
at System.Web.HttpApplication.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
3) In Visual Studio 2015 when trying to connect :
CData elements not valid at top level of an XML document. Line 1, position 3.
How can I fix it?
The only resource I could find related to this issue is an MSDN forums post.
I suspect that you tried to install Windows Server AppFabric, but have not configured it. If you are not using Windows Server AppFabric, you should uninstall/unconfigure it.
This comment was enlightening, but a little scary since I actually rely on AppFabric !!!
I am only however using the caching functionality and it turns out AppFabric has a whole Service Management Service that intercepts requests - or something to that effect. I wasn't using that.
I was able therefore to just uninstall the hosting components to fix the issue.
Programs and Features AppFabric 1.1 for Windows Server and click Change Hosting Services 
Continue with Next to remove this component.
You should now be able to run TFS without conflict with AppFabric.
If you're actually using the Hosting Services you probably already know more than I do about how it works so I hope you can take it from there to diagnose the problem. The original error message should give some direction then.
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