Failing getting windows identity

[Pall Olafss]

Hi,

We are facing a strange behavior in our environment. We are running stress
test on our web application and for some reason the application fails getting
the user idenity but only sometimes. It works 99% but the application throws
this exception like once every 10 sec.

We are running .net 3.5 and using Kerberos. I cant find much information
about this error so I hope you can help me out.

Here is the exception;

Timestamp: 7/20/2010 4:36:35 PM
Message: HandlingInstanceID: cbd6db58-3201-437c-86c8-ffc63b772b1d
An exception of type 'System.Web.HttpUnhandledException' occurred and was
caught.
---------------------------------------------------------------------------------
07/20/2010 16:36:35
Type : System.Web.HttpUnhandledException, System.Web, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Message : Exception of type 'System.Web.HttpUnhandledException' was thrown.
Source : System.Web
Help link :
ErrorCode : -2147467259
Data : System.Collections.ListDictionaryInternal
TargetSite : Boolean HandleError(System.Exception)
Stack Trace : at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at ASP.pages_librarycollectionview_aspx.ProcessRequest(HttpContext context)
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)

Additional Info:

MachineName :
TimeStamp : 7/20/2010 4:36:35 PM
FullName : Microsoft.Practices.EnterpriseLibrary.ExceptionHandling,
Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
AppDomainName :
ThreadIdentity :
WindowsIdentity :
Inner Exception
---------------
Type : System.ArgumentNullException, mscorlib, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Value cannot be null.
Parameter name: ptr
Source : mscorlib
Help link :
ParamName : ptr
Data : System.Collections.ListDictionaryInternal
TargetSite : System.String PtrToStringUni(IntPtr, Int32)
Stack Trace : at
System.Runtime.InteropServices.Marshal.PtrToStringUni(IntPtr ptr, Int32 len)
at
System.Security.Principal.SecurityIdentifier.TranslateToNTAccounts(IdentityReferenceCollection sourceSids, Boolean& someFailed)
at
System.Security.Principal.SecurityIdentifier.Translate(IdentityReferenceCollection sourceSids, Type targetType, Boolean& someFailed)
at
System.Security.Principal.SecurityIdentifier.Translate(IdentityReferenceCollection sourceSids, Type targetType, Boolean forceSuccess)
at System.Security.Principal.SecurityIdentifier.Translate(Type targetType)
at System.Security.Principal.WindowsIdentity.GetName()
at System.Security.Principal.WindowsIdentity.get_Name()
....

Category: General
Priority: 0
EventId: 100
Severity: Error
TitleSE
Machine:
Application Domain:
Process Id: 4292
Process Name: c:\winnt\system32\inetsrv\w3wp.exe
Win32 Thread Id: 244
Thread Name:
Extended Properties: