Exchange 2013 ECP .Net error

Hi I just installed exchange 2013 on a domain controller in a test environment. OWA works, but if I try to access https://servername/ecp I get the following error:

Server Error in '/ecp' Application.
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NegotiateSecurityContext failed with LogonDenied
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: NegotiateSecurityContext failed with LogonDenied

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace:


[HttpException (0x80004005): NegotiateSecurityContext failed with LogonDenied]
   Microsoft.Exchange.HttpProxy.ProxyRequestHandler.EndProcessRequest(IAsyncResult result) +604
   System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +210
 
the following is logged in the eventlog:

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 12/27/2012 11:27:39 PM
Event time (UTC): 12/28/2012 4:27:39 AM
Event ID: a77ad86febc042a78a5f903b83aa0642
Event sequence: 176
Event occurrence: 14
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/1/ROOT/ecp-5-130011412568254657
    Trust level: Full
    Application Virtual Path: /ecp
    Application Path: C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\ecp\
    Machine name: ALPHA2
 
Process information:
    Process ID: 17860
    Process name: w3wp.exe
    Account name: NT AUTHORITY\SYSTEM
 
Exception information:
    Exception type: HttpException
    Exception message: NegotiateSecurityContext failed with LogonDenied
   at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.EndProcessRequest(IAsyncResult result)
   at System.Web.HttpApplication.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar)

 
 
Request information:
    Request URL: https://alpha2:443/ecp/ 
    Request path: /ecp/
    User host address: fe80::e103:3fb3:bff:d233C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\ecp\
    User: CRYPTZ\SM_235cdaff9cfb4207a
    Is authenticated: True
    Authentication Type: Basic
    Thread account name: NT AUTHORITY\SYSTEM
 
Thread information:
    Thread ID: 58
    Thread account name: NT AUTHORITY\SYSTEM
    Is impersonating: False
    Stack trace:    at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.EndProcessRequest(IAsyncResult result)
   at System.Web.HttpApplication.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar)
 
 
Custom event details:


I am unable to find anything about:NegotiateSecurityContext

any help woud be appreciated.