Iis – TFS 2013 intermittent error: TF400732: the request has been canceled

Recently, we installed TFS 2013. Since installing it, we keep getting the error "TF400732: the request has been canceled." when opening TFS with the browser or performing some tasks from Visual Studio.

If I look in the event log, the only thing I can find is the following:

Event code: 3005 Event message: An unhandled exception has occurred.
Event time: 8/29/2014 1:33:46 PM Event time (UTC): 8/29/2014 3:33:46
AM Event ID: 32182dd8dc6447af8d6915a3ec4916eb Event sequence: 5
Event occurrence: 1 Event detail code: 0 Application information:
Application domain: /LM/W3SVC/2/ROOT/tfs-9-130537568240022662
Trust level: Full
Application Virtual Path: /tfs
Application Path: C:\Program Files\Microsoft Team Foundation Server 12.0\Application Tier\Web Services\
Machine name: ISMY-SVN-PC Process information:
Process ID: 2676
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE Exception information:
Exception type: RequestCanceledException
Exception message: TF400732: The request has been canceled. at Microsoft.TeamFoundation.Framework.Server.TeamFoundationRequestContext.GetServiceT
at
Microsoft.TeamFoundation.Server.WebAccess.TfsHelpers.GetProjectFromName(TeamFoundationRequestContext
tfsRequestContext, String projectName) at
Microsoft.TeamFoundation.Server.WebAccess.TfsWebContext.Initialize()
at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.get_TfsWebContext()
at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.get_TfsRequestContext()
at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.SetCurrentThreadCulture(ITfsController
controller) at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.OnActionExecuting(ActionExecutingContext
ctx) at
System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeActionMethodFilterAsynchronously(IActionFilter
filter, ActionExecutingContext preContext, Func1 nextInChain) at
System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__31(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag) at
System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.b__1e(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag) at
System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback,
Object state) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback,
Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate
endDelegate, Object tag) at
System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext,
AsyncCallback callback, Object state) at
System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback,
Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate
endDelegate, Object tag) at
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase
httpContext, AsyncCallback callback, Object state) at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

Request information: 
Request URL: http://ismy-svn-pc:8080/tfs/DefaultCollection/Call Scripter/_admin 
Request path: /tfs/DefaultCollection/Call Scripter/_admin 
User host address: 172.16.8.160 
User: JLRXMELB\meno 
Is authenticated: True 
Authentication Type: NTLM 
Thread account name: NT AUTHORITY\NETWORK SERVICE    Thread information: 
Thread ID: 26 
Thread account name: NT AUTHORITY\NETWORK SERVICE 
Is impersonating: False 
Stack trace:    at Microsoft.TeamFoundation.Framework.Server.TeamFoundationRequestContext.GetService[T]()

at
Microsoft.TeamFoundation.Server.WebAccess.TfsHelpers.GetProjectFromName(TeamFoundationRequestContext
tfsRequestContext, String projectName) at
Microsoft.TeamFoundation.Server.WebAccess.TfsWebContext.Initialize()
at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.get_TfsWebContext()
at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.get_TfsRequestContext()
at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.SetCurrentThreadCulture(ITfsController
controller) at
Microsoft.TeamFoundation.Server.WebAccess.TfsController.OnActionExecuting(ActionExecutingContext
ctx) at
System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeActionMethodFilterAsynchronously(IActionFilter
filter, ActionExecutingContext preContext, Func1 nextInChain) at
System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__31(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag) at
System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.b__1e(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag) at
System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback,
Object state) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback,
Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate
endDelegate, Object tag) at
System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext,
AsyncCallback callback, Object state) at
System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback
asyncCallback, Object asyncState) at
System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.Begin(AsyncCallback
callback, Object state, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin[TResult](AsyncCallback
callback, Object state, BeginInvokeDelegate beginDelegate,
EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) at
System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback,
Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate
endDelegate, Object tag) at
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase
httpContext, AsyncCallback callback, Object state) at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)

Rebooting the server usually fixes the problem, then it comes back again after a while.

Any ideas?