Error - Validation Of Viewstate MAC Failed

Jul 14, 2011

I don't know what is causing this. The weird thing is, eventually, it goes away (as in, i get to see the web application form), BUT my web app does not work properly. I have image buttons that are not showing the image that I set at imageButton.ImageUrl. It works fine when I run it on my local machine (IIS), but when I try it on one of those free hosting sites, it will go as far as showing the interface (which has the image buttons), but when I click, it suppose to be set with an image.

btw, the first aspx page contains a ListView control, then after clicking on a button in that page, it goes to another page that contains a bunch of imagebuttons and an ajax timer control. I get the " Validation of viewstate MAC failed" error AFTER clicking on the button (in the ListView page).

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Web Forms :: Validation Of Viewstate MAC Failed - How To Fix This Error

Feb 15, 2011

I have simply created two aspx pages for testing purpose, Page1.aspx and Page2.aspx.

Page1.aspx code is as follows:

[Code]....

And Page2.aspx simply have this code:

[Code]....

Now,when i run Page1.aspx and press the button i am getting this error. Can anyone tell me why this error is occuring ?

ERROR:

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. review the stack trace for more information about the error and where it originated in the code.

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Validation Of Viewstate MAC Failed / How To Repair This Error

Aug 19, 2010

have this error in server..

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. 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, 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.

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When i keep the .aspx page open or iden for long period on browser and then clicks on button after some time , it shows me the

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I have an application that works fine, problem rise when a page is waiting for the user response for more than 20 min and then user click a link on the form. The application response with the following error -

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Validation Of Viewstate MAC Failed Error When Running Project

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when i run my project i got bellow error...

"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."

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I'm trying to figure out this error but I can't point out what's exactly causing this.Here is what's happening.User loggs in for a few hours and gets "Validation of viewstate MAC failed" Error after post back.I have set timeout in Web.config as follow.

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I deploy a simple web app,that works fine on my local system, on a remote server. The webform consist of a Menu control and a Listview control. If I browse the page and then leave it for like 20 minutes untouched and then try to select an entry from the menu I am getting the following error -

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User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; AskTB5.6)
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Before that I used to get the following error -

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.So I added the following to the Pages tag in the web.config validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never"

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IIS Configuration :: Error When User Session Expire - Validation Of Viewstate MAC Failed

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if my website when session of user expire i get the following error.

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I have a problem in my web site ...

When ever i left my website idle ...

The following message is displayed ...

After this message is displayed , no pages is able to access ....

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Validation Of Viewstate MAC Failed.?

Jan 19, 2011

i have these message in only one user of my web ASP.NET application.

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C# - Validation Of ViewState MAC Failed?

Nov 9, 2010

After changing the Master Page in ASP.NET MVC 1.0 application, I keep getting this familiar error when I try a postback without filling in the mandatory form elements which are validated by the server:

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

The new page refers to a lot of jQuery code with lightboxes, superfish etc. Could that be a problem while doing a postback?

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After a little debugging, I've realized that a directive in the master page:

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MVC :: Validation Of Viewstate MAC Failed?

Apr 29, 2010

I am trying a MVC 2 application on my computer's IIS and when I go to a page that contains a form I get the following error:

-----------------------

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.
------------------------------

What is strange is that on the begining the form is ok but after a while I started to get this error.And why at the start everything was ok and after a while I started to get this error?

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Validation Of Viewstate MAC Failed - How To Avoid It

Jan 25, 2010

I know this is a very common problem and a quick search in google offers a lot of solutions. However I could only find one person that came across it in the same way I am and no-one answered their question.

The scenario which causes this is if the page has been left dormant for a period of time and then a button is pressed which runs some sort of command. This might be pressing the logout button or trying to submit a contact form after having walked away at some point and then returning and hitting Send.

I do not have posts or actions in my form, it looks like this: <form id="form1" runat="server">

I have also added the following line to my web.config: <pages enableEventValidation="false" iewStateEncryptionMode="Never">

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VS 2005 Validation Of Viewstate MAC Failed - How To Fix It

Jul 28, 2010

I have a web page that shows all contacts and its running fine.

When user does not activity for some time and after that user clicks the button to download records, its shows message:

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I am not getting where this problem arise and what to do to solve.

One imp thing, after being inactive for some time when I log out and then log in then its works fine.

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Web Forms :: Validation Of Viewstate MAC Failed?

Sep 2, 2010

this avoids a MAC error

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.

I add this to webconfig and it works

<pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode="Never" enableViewStateMac="false">

why does it work and what an earth is this error as it makes no sense to me. it is to do with sessions.

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AJAX :: Validation Of Viewstate MAC Failed?

Dec 29, 2010

I have a search page and it works most of the time but every now and then when I enter another word to search again, I kept getting this error in the Firefox's Error Console:

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IIS Configuration :: Validation Of Viewstate MAC Failed

May 7, 2015

i have a webapplication hosted on web server. when i open page example login page , if i login after 2-3 mins or open any page after some time i face error, mentioned below. 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. URL...

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.URL...

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, 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.

[ViewStateException: Invalid viewstate.
Client IP: 14.98.31.134
Port: 59961
Referer: http://www.arpfashions.com/admin/index.aspx
Path: /admin/index.aspx

[code]....

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Validation Of Viewstate MAC Failed / Change Selection In A DDL

May 7, 2010

Sutring the website that im building, I opened up a page and left it open for about 40 minutes.

Next, i was trying to change selection in a DDL and got this error messag : Validation of viewstate MAC failed.

I read a bit abou the problem, still can't figure out why it happens, but it was written that a good workaround is :

[code]...

and third : I've thought about another solution. If the problem occurred while waiting, perhaps force refresh after certain amount of minutes of user doing nothing with the page. I think that I can perform the refresh using response.redirect, but what about the "WAITING "CERTAIN AMOUNT IF MINUTES OF USER DOING NOTHING WITH THE PAGE" part?

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System.Web.HttpException - Validation Of Viewstate MAC Failed?

Apr 10, 2010

I have a website(connect to active directory and pull the required details) deployed on the production web server and it is working fine from last one year.

But from last two days users are getting the following error frequently and find the error details below:-

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[code]....

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Validation Of Viewstate MAC Failed When On Page For 20+ Minutes?

Jan 14, 2011

If you open a web page on one of the websites hosted on our server, and leave it for 20 minutes, and then submit a form, a "Validation of viewstate MAC failed." error occurs.

What possible reasons could there be for this?

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State Management :: Validation Of Viewstate MAC Failed?

Dec 29, 2010

In our control environment, we've started, somewhat intermittently, getting:

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.

on our website.It also suggests:

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.

We already have compilation debug as true. We have upgraded our website to ASP.NET 4.0, although our middle tier components are still at 3.5. As we do in out production machine configs (which are using ASP.NET 3.5) we have

<section type="System.Web.Configuration.MachineKeySection, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=abcabc123123" allowDefinition="MachineToApplication"/>

we also have one in the new .NET 4.0 machine.config:

<section type="System.Web.Configuration.MachineKeySection, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=abcabc123123" allowDefinition="MachineToApplication" />

This control environment is not in a server farm. Why is it suggesting that I turn on debug, when it's already on. Why isn't it showing me my source code?

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State Management :: Validation Of Viewstate MAC Failed ...?

Mar 1, 2011

I have this error:

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.

my website was designed using dotnet 2003 worked under dotnet framework 1.0 the website was working fine then i had to upgrade the server to windows 2008 iis 7.0 so i configured the website to work under dotnet frame work 2.0 and the problem started to show up

i have tried many

enableViewStateMac="false" viewStateEncryptionMode="Never" enableEventValidation="false"
<machineKey validationKey="AutoGenerate,IsolateApps" validation="SHA1" decryption="Auto" decryptionKey="AutoGenerate,IsolateApps" />

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Web Forms :: Google Chrome And Validation Of Viewstate MAC Failed

Jan 15, 2010

Anyone has experence with "Validation of viewstate MAC failed" issue while using Google Chrome? We have a customer having specific issue with Chrome. It's the strangest thing. In IE and Firefox, the problem does not exist, but once Google Chrome is used instead, he gets the error.

*note, we already have <pages
enableViewStateMac="false"
enableEventValidation="false"/>

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