MSExchange Front End HTTP Proxy - error number 1003

Hello,

I get an error and a warning (which I think are related):

MSExchange Front End HTTP Proxy - error number 1003

[Autodiscover] An internal server error occurred. The unhandled exception was: System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Object.GetType()
   at Microsoft.Exchange.HttpProxy.DatacenterRedirectStrategy.CheckLiveIdBasicPartialAuthResult(HttpContext httpContext)
   at Microsoft.Exchange.HttpProxy.AutodiscoverProxyRequestHandler.OnInitializingHandler()
   at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<>c__DisplayClass8.<Run>b__7()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)

also a warning

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 1/10/2013 3:44:18 
Event time (UTC): 1/10/2013 1:44:18 
Event ID: 866864c933654067b8bba943a29f19e2 
Event sequence: 36 
Event occurrence: 35 
Event detail code: 0 
 
Application information: 
    Application domain: /LM/W3SVC/1/ROOT/Autodiscover-1-130250651378865433 
    Trust level: Full 
    Application Virtual Path: /Autodiscover 
    Application Path: C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\Autodiscover\ 
    Machine name: PR-W12-MX01 
 
Process information: 
    Process ID: 10764 
    Process name: w3wp.exe 
    Account name: NT AUTHORITY\SYSTEM 
 
Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object.
   at System.Object.GetType()
   at Microsoft.Exchange.HttpProxy.DatacenterRedirectStrategy.CheckLiveIdBasicPartialAuthResult(HttpContext httpContext)
   at Microsoft.Exchange.HttpProxy.AutodiscoverProxyRequestHandler.OnInitializingHandler()
   at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<>c__DisplayClass8.<Run>b__7()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)
   at Microsoft.Exchange.HttpProxy.Diagnostics.SendWatsonReportOnUnhandledException(MethodDelegate methodDelegate)
   at Microsoft.Exchange.HttpProxy.ProxyModule.OnPostAuthorizeInternal(HttpApplication httpApplication)
   at Microsoft.Exchange.HttpProxy.ProxyModule.<>c__DisplayClassb.<OnPostAuthorizeRequest>b__a()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)
   at Microsoft.Exchange.HttpProxy.Diagnostics.SendWatsonReportOnUnhandledException(MethodDelegate methodDelegate)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

 
 
Request information: 
    Request URL: https://<domainname>:443/Autodiscover/Autodiscover.xml 
    Request path: /Autodiscover/Autodiscover.xml 
    User host address: 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: NT AUTHORITY\SYSTEM 
 
Thread information: 
    Thread ID: 14 
    Thread account name: NT AUTHORITY\SYSTEM 
    Is impersonating: False 
    Stack trace:    at System.Object.GetType()
   at Microsoft.Exchange.HttpProxy.DatacenterRedirectStrategy.CheckLiveIdBasicPartialAuthResult(HttpContext httpContext)
   at Microsoft.Exchange.HttpProxy.AutodiscoverProxyRequestHandler.OnInitializingHandler()
   at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<>c__DisplayClass8.<Run>b__7()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)
   at Microsoft.Exchange.HttpProxy.Diagnostics.SendWatsonReportOnUnhandledException(MethodDelegate methodDelegate)
   at Microsoft.Exchange.HttpProxy.ProxyModule.OnPostAuthorizeInternal(HttpApplication httpApplication)
   at Microsoft.Exchange.HttpProxy.ProxyModule.<>c__DisplayClassb.<OnPostAuthorizeRequest>b__a()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate)
   at Microsoft.Exchange.HttpProxy.Diagnostics.SendWatsonReportOnUnhandledException(MethodDelegate methodDelegate)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 
 

Any idea what is wrong?

The system is a single box Exchange 2013. I also have seperate domain controllers.

I also have the HTTP 500 error when testing with outlook (CTRL right click on the notification icon) for autodiscover...