Event 1309, ASP.Net 4.0.30319.0 Error in Event Viewer

I'm frequently seeing the following warning in the event viewer on both of our Web Access servers.

This is something that has started since upgrading to version 7.7.1

It appears to be related to the way attachments are handled.

Any ideas?

Event code: 3005

Event message: An unhandled exception has occurred.

Event time: 5/21/2014 9:40:39 AM

Event time (UTC): 5/21/2014 1:40:39 PM

Event ID: 3438a51897534494b4784a49d7311d55

Event sequence: 8070

Event occurrence: 23

Event detail code: 0

Application information:

Application domain: /LM/W3SVC/1/ROOT/Integrated.WebAccess-1-130451364529399315

Trust level: Full

Application Virtual Path: /Integrated.WebAccess

Application Path: D:\Program Files (x86)\LANDesk\Service Desk\WebApp\WebAccess\

Machine name: SWJAX1P1005

Process information:

Process ID: 4684

Process name: w3wp.exe

Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:

Exception type: HttpException

Exception message: Server cannot set status after HTTP headers have been sent.

at System.Web.HttpResponse.set_StatusCode(Int32 value)

at Touchpaper.Web.Console.Components.RescueAttribute.OnException(ExceptionContext filterContext)

at System.Web.Mvc.ControllerActionInvoker.InvokeExceptionFilters(ControllerContext controllerContext, IList`1 filters, Exception exception)

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult)

at System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)

at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)

at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)

at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Request information:

Request URL: http://supportcenter/Integrated.WebAccess/wd/Object/GetAttachment.rails?class_name=ChangeManagement._ChangeDetail&key=6f515f40-af65-477b-8d8a-098be112a7cc&attribute=_Attachment

Request path: /Integrated.WebAccess/wd/Object/GetAttachment.rails

User host address: 10.1.1.243

User: CORPORATE\smatthews

Is authenticated: True

Authentication Type: NTLM

Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:

Thread ID: 80

Thread account name: NT AUTHORITY\NETWORK SERVICE

Is impersonating: False

Stack trace: at System.Web.HttpResponse.set_StatusCode(Int32 value)