RadToolTipManager response error:

[DAI]

RadToolTipManager response error:
 Exception=Sys.WebForms.PageRequestManagerServerErrorException: 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.

[Svetlina Anati]

Hello DAI,

 

This error is not directly related to RadControls but to your custom code and general ASP.NET knowledge.This error occurs when the layout of the form being submitted differs from what has been defined on the server side and you have validation enabled. This is usually caused by adding new fields, or items to forms using client script, or the end user submits the form before the page has finished rendering because the server needs the following line

<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION"
value="somestringofgiberish"

to be correctly rendered before submitting the form. It is a feature to stop people submitting their own forms to your ASP.net page.

What I can suggest is to set the enableEventValidation property to false either in the page directive or in the Web.config. This should fix the problem but I also recommend to search the net for other possible solutions.

All the best,
Svetlina
the Telerik team

[Andrei]

Hi,

I am getting this silly error:
Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)
Timestamp: Fri, 29 Jul 2011 14:44:20 UTC

Message: Sys.WebForms.PageRequestManagerServerErrorException: 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.
Line: 5
Char: 16109
Code: 0
URI: http://localhost:5986/IDS/ScriptResource.axd?d=5bo2SsFDxX8_VBtRRIHx2kB2kPajBJSu5WuFQqYY4kxoZb0o1vio1EAIfBTqznedsdAbWfJeNYUQbXVgHX-50Y60ydJMKOnrQnjKCoOQ7f203LvpXsR50f3J0Obqd0ORWsfgg7V0rtNy-5M-7wSFGb0EtKb25TwjnxSa18g36jvfFbJn0&t=ffffffffa5d4ef3e

I have tried what you suggest in the Web.config file and does not work.

<pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never">
        <controls>
            <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI"/>
            <add tagPrefix="sitefinity" namespace="Telerik.Sitefinity.Web.UI.Fields" assembly="Telerik.Sitefinity"/>
        </controls>
    </pages>

Anybody else has come accross this issue.

Thanks,
Andrei

[Marin Bratanov]

Hi Andrei,

This error is usually related to the ViewState of your page and not to the Telerik controls. Please examine the following google search for ways to combat this issue:
http://www.google.com/search?&q=Validation+of+viewstate+MAC+failed
and, for example, these resources:
http://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx
http://www.eukhost.com/forums/f15/fix-validation-viewstate-mac-failed-6085/
as they propose some alternate solutions to the one you already tried.
I hope this will help you resolve the situation.


Greetings,
Marin
the Telerik team

[Andrei]

Hi Martin,

Sorry for not getting back to this thread. Your colleague Georgi Chokov  has
given me a helping hand and now its working. The solution was:

<pages enableViewStateMac="false" enableEventValidation="false">

I hope someone else will find this helpful.

Many thanks again,
Andrei