What I can see is that the CPU is very high for the website IIS worker process.

Log files aren't saying anything about errors or warnings...

/Michaël

Have you tried ending the iis worker process in task manager - I know not ideal, but may be enough to get the site back up -then work out what caused it?

Hi Bex,

already tried it but directly it goes back to 99% CPU.

All other website are running fine on the VPS.

/Michaël

Hi Michaël,

Is it only the front end or also the backend ?

Dave

Dave,

both front end and back end.

The application pool had 32 bit applications enabled. I have set this back to false and now the cpu is dropped back and now its running fine for the moment.

/Michaël

The only thing I now see in the logs is:

2017-05-04 10:22:39,341 [P5076/D2/T22] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
System.Security.Cryptography.CryptographicException: Error occurred during a cryptographic operation.
   at System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.HomogenizeErrors(Func`2 func, Byte[] input)
   at System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket)
   at Umbraco.Core.StringExtensions.DecryptWithMachineKey(String value)
   at Umbraco.Web.Mvc.RenderRouteHandler.GetFormInfo(RequestContext requestContext)
   at Umbraco.Web.Mvc.RenderRouteHandler.GetHandlerForRoute(RequestContext requestContext, PublishedContentRequest publishedContentRequest)
   at System.Web.Routing.UrlRoutingModule.PostResolveRequestCache(HttpContextBase context)
   at Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 2017-05-04 10:22:45,022 [P5076/D2/T16] INFO  umbraco.BusinessLogic.Log - Log scrubbed.  Removed all items older than 2017-05-03 10:22:44
 2017-05-04 10:23:05,522 [P5076/D2/T24] WARN  Umbraco.Web.UmbracoModule - Status code is 404 yet TrySkipIisCustomErrors is false - IIS will take over.
 2017-05-04 10:23:26,084 [P5076/D2/T19] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
System.Security.Cryptography.CryptographicException: Error occurred during a cryptographic operation.
   at System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.HomogenizeErrors(Func`2 func, Byte[] input)
   at System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket)
   at Umbraco.Core.StringExtensions.DecryptWithMachineKey(String value)
   at Umbraco.Web.Mvc.RenderRouteHandler.GetFormInfo(RequestContext requestContext)
   at Umbraco.Web.Mvc.RenderRouteHandler.GetHandlerForRoute(RequestContext requestContext, PublishedContentRequest publishedContentRequest)
   at System.Web.Routing.UrlRoutingModule.PostResolveRequestCache(HttpContextBase context)
   at Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 2017-05-04 10:23:27,741 [P5076/D2/T23] WARN  Umbraco.Web.UmbracoModule - Status code is 404 yet TrySkipIisCustomErrors is false - IIS will take over.
 2017-05-04 10:23:31,803 [P5076/D2/T28] INFO  Umbraco.Core.Security.UmbracoMembershipProviderBase - Login attempt succeeded for username desitter from IP address 81.82.207.127
 2017-05-04 10:23:32,959 [P5076/D2/T13] INFO  Umbraco.Core.Security.UmbracoMembershipProviderBase - Login attempt succeeded for username lukri from IP address 91.183.108.80
 2017-05-04 10:24:00,334 [P5076/D2/T19] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
System.Web.Mvc.HttpAntiForgeryException (0x80004005): The anti-forgery cookie token and form field token do not match.
   at System.Web.Helpers.AntiXsrf.TokenValidator.ValidateTokens(HttpContextBase httpContext, IIdentity identity, AntiForgeryToken sessionToken, AntiForgeryToken fieldToken)
   at System.Web.Helpers.AntiXsrf.AntiForgeryWorker.Validate(HttpContextBase httpContext)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__19(AsyncCallback asyncCallback, Object asyncState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.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.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   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)
 2017-05-04 10:24:00,620 [P5076/D2/T24] WARN  Umbraco.Web.UmbracoModule - Status code is 404 yet TrySkipIisCustomErrors is false - IIS will take over.
 2017-05-04 10:25:02,694 [P5076/D2/T13] INFO  Umbraco.Core.Security.UmbracoMembershipProviderBase - Login attempt succeeded for username vanpuyenbroeck from IP address 213.211.160.148
 2017-05-04 10:25:05,819 [P5076/D2/T17] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
System.Security.Cryptography.CryptographicException: Error occurred during a cryptographic operation.
   at System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.HomogenizeErrors(Func`2 func, Byte[] input)
   at System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket)
   at Umbraco.Core.StringExtensions.DecryptWithMachineKey(String value)
   at Umbraco.Web.Mvc.RenderRouteHandler.GetFormInfo(RequestContext requestContext)
   at Umbraco.Web.Mvc.RenderRouteHandler.GetHandlerForRoute(RequestContext requestContext, PublishedContentRequest publishedContentRequest)
   at System.Web.Routing.UrlRoutingModule.PostResolveRequestCache(HttpContextBase context)
   at Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 2017-05-04 10:25:05,960 [P5076/D2/T23] WARN  Umbraco.Web.UmbracoModule - Status code is 404 yet TrySkipIisCustomErrors is false - IIS will take over.
 2017-05-04 10:25:12,600 [P5076/D2/T13] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred
System.Web.Mvc.HttpAntiForgeryException (0x80004005): The anti-forgery cookie token and form field token do not match.
   at System.Web.Helpers.AntiXsrf.TokenValidator.ValidateTokens(HttpContextBase httpContext, IIdentity identity, AntiForgeryToken sessionToken, AntiForgeryToken fieldToken)
   at System.Web.Helpers.AntiXsrf.AntiForgeryWorker.Validate(HttpContextBase httpContext)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__19(AsyncCallback asyncCallback, Object asyncState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.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.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext)
   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)
 2017-05-04 10:25:12,678 [P5076/D2/T23] WARN  Umbraco.Web.UmbracoModule - Status code is 404 yet TrySkipIisCustomErrors is false - IIS will take over.

Ok after couple of minutes, the CPU is going back to 50 - 70% but not 99 anymore...

/Michaël

Some others errors from the log:

2017-05-04 10:34:34,475 [P5076/D2/T34] ERROR Umbraco.Core.Security.AuthenticationExtensions - The current identity cannot be converted to Umbraco.Core.Security.UmbracoBackOfficeIdentity
System.InvalidOperationException: Cannot create a Umbraco.Core.Security.UmbracoBackOfficeIdentity from System.Security.Claims.ClaimsIdentity since the required claim http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier is missing
   at Umbraco.Core.Security.UmbracoBackOfficeIdentity.FromClaimsIdentity(ClaimsIdentity identity)
   at Umbraco.Core.Security.AuthenticationExtensions.GetCurrentIdentity(HttpContextBase http, Boolean authenticateRequestIfNotFound)
 2017-05-04 10:34:34,647 [P5076/D2/T23] ERROR Umbraco.Core.Security.AuthenticationExtensions - The current identity cannot be converted to Umbraco.Core.Security.UmbracoBackOfficeIdentity
System.InvalidOperationException: Cannot create a Umbraco.Core.Security.UmbracoBackOfficeIdentity from System.Security.Claims.ClaimsIdentity since the required claim http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier is missing
   at Umbraco.Core.Security.UmbracoBackOfficeIdentity.FromClaimsIdentity(ClaimsIdentity identity)
   at Umbraco.Core.Security.AuthenticationExtensions.GetCurrentIdentity(HttpContextBase http, Boolean authenticateRequestIfNotFound)
 2017-05-04 10:34:36,475 [P5076/D2/T12] INFO  Umbraco.Core.Security.BackOfficeSignInManager - Event Id: 0, state: Login attempt succeeded for username [email protected] from IP address 91.183.108.80
 2017-05-04 10:34:36,491 [P5076/D2/T12] INFO  Umbraco.Core.Security.BackOfficeSignInManager - Event Id: 0, state: User: [email protected] logged in from IP address 91.183.108.80
 2017-05-04 10:34:36,600 [P5076/D2/T12] ERROR Umbraco.Web.WebApi.Filters.AngularAntiForgeryHelper - Could not validate XSRF token
System.Web.Mvc.HttpAntiForgeryException (0x80004005): The anti-forgery token could not be decrypted. If this application is hosted by a Web Farm or cluster, ensure that all machines are running the same version of ASP.NET Web Pages and that the <machineKey> configuration specifies explicit encryption and validation keys. AutoGenerate cannot be used in a cluster.
   at System.Web.Helpers.AntiXsrf.AntiForgeryTokenSerializer.Deserialize(String serializedToken)
   at System.Web.Helpers.AntiXsrf.AntiForgeryWorker.Validate(HttpContextBase httpContext, String cookieToken, String formToken)
   at Umbraco.Web.WebApi.Filters.AngularAntiForgeryHelper.ValidateTokens(String cookieToken, String headerToken)

Hi Michael,

Have you checked for anything odd in the IIS logs as opposed to the Umbraco logs? Also, is there anything in Event Viewer?

is working on a reply...