HI,

We are having problems in one of our sites. The sites occasionally goes down with a NullReferenece exception when user controls are being loaded. The strange thing is that if we change some code, or try to fix suspects in the user control mentioned in the exeption message, the same error will happen, but then maybe with a different user control referred to in the exception message. IISReset will not fix the problem, however if we stop the site in IISmanager, then just start it again, the site comes back up with no problem. Then it may work for severeal hours before it suddenly stops working again. Anyone have an idea of what to look after? Things to test?

System is Windows server Enterprice SP2 64bit. Other sites are running just fine on the same server.. Hope someone can help me on this one

best regards Fredrik

Event code: 3005

Event message: An unhandled exception has occurred.

Event time: 07.04.2011 00:00:00

Event time (UTC): 06.04.2011 22:00:00

Event ID: 44976d54f104459fa6b747a9cd0aa357

Event sequence: 6

Event occurrence: 1

Event detail code: 0

Application information:

    Application domain: /LM/W3SVC/2/ROOT-1-129466007785078891

    Trust level: Full

    Application Virtual Path: /

    Application Path: C:\xxxxxxxxxx\

    Machine name: xxxxx

Process information:

    Process ID: 4528

    Process name: w3wp.exe

    Account name: xxx

Exception information:

    Exception type: NullReferenceException

    Exception message: Object reference not set to an instance of an object.

Request information:

    Request URL: xxxxxxxxxxx/default.aspx?id=3&epslanguage=no

    Request path: /default.aspx

    User host address: xx.xx.xx.xx

    User: 

    Is authenticated: False

    Authentication Type: 

    Thread account name: xxxxxxxxx

Thread information:

    Thread ID: 10

    Thread account name: xxxxxx

    Is impersonating: False

    Stack trace:    at EPiServer.Templates.Public.Units.Static.Header.OnLoad(EventArgs e)

   at System.Web.UI.Control.LoadRecursive()

   at System.Web.UI.Control.LoadRecursive()

   at System.Web.UI.Control.LoadRecursive()

   at System.Web.UI.Control.LoadRecursive()

   at System.Web.UI.Control.LoadRecursive()

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)