Keep getting locked out

Hi

I keep getting locked out of Umbraco and also receive an error: Could someone please offer some advise? Thanks

Server Error in '/' Application.

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:


[ViewStateException: Invalid viewstate. 
    Client IP: 109.153.91.159
    Port: 61120
    Referer: http://www.dickwhitereferrals.com/umbraco/Login.aspx?redir=%2fumbraco%2fumbraco.aspx
    Path: /umbraco/Login.aspx
    User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10) AppleWebKit/600.2.5 (KHTML, like Gecko) Version/8.0.2 Safari/600.2.5
    ViewState: 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]

[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +198
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +432
   System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose) +8
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +40
   System.Web.UI.HiddenFieldPageStatePersister.Load() +248
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +88
   System.Web.UI.Page.LoadAllState() +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6704
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
   System.Web.UI.Page.ProcessRequest() +72
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +58
   ASP.umbraco_login_aspx.ProcessRequest(HttpContext context) +4
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

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Dennis Aaen 4500 posts 18255 karma points admin hq c-trib

Jan 02, 2015 @ 16:14