Web Forms :: Validation Of Viewstate MAC Failed / User Clicks The Button To Download Records

Jul 28, 2010

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

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

Validation of viewstate MAC failed I not getting where this problem arise and what to do to solve.

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

I assume it can be session timeout problem, but dont know how to deal with it.

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

Jan 30, 2014

if my website when session of user expire 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.

My website is in vs3.5

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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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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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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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Web Forms :: Validation Of Viewstate MAC Failed / Error When Run Homepage

Aug 10, 2010

I am having a small problem with my links on the master page. I have inserted 5 link buttons on my masterpage. In every link, I have set the PostBackUrl to the corresponding page. In the link click event, I have also written the C# coding: Response.Redirect(). When I run the homepage (that is using the masterpage as a template) and click on one of the link, I get this error: Validation of viewstate MAC failed.....

What should I do to fix this error?

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

Dec 9, 2010

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 -

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 read a few articles regarding setting the Pages tag in web.config and set the Pages tag to the following -

[code]....

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Web Forms :: URL Rewriting Causing Validation Of Viewstate MAC Failed?

Nov 22, 2010

Has anyone encountered while using Context.RewriteUrl in global.asax causes 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 ?

Here is the scenario, let's say I have a url

http://mysite.com/admin/login.aspx instead typing the whole url in address, user can type either
http://mysite.com/admin/ or http://mysite.com/admin which all end up at http://mysite.com/admin/login.aspx. When a user type http://mysite.com/admin and entered correct login info, and press login button it gets the error above. How can I resolve this? Tried setting EnableValidateRequest to false and EnableViewstateMac to false also even I do not want to use this approach and still does not work.

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Web Forms Site Setup - Validation Of ViewState MAC Failed

Mar 11, 2016

I have just setup a new ASP.NET Web Forms Site cleared out the default contents and added a button and a click event. That's it. Yet trying to run the page I get the error in the subject.

Looking around the web and this forum I have tried numerous things, including setting the <pages> tag each of the following three ways (not at the same time of course), adding debug = true to various places, etc. but the error persists.

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

Here is the code, as you can see there is really nothing in the site yet:

Default.aspx

Code:
<%@ Page Title="Home Page" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<p><asp:Button ID="Button1" runat="server" Text="Button1"/>
</asp:Content>
Default.aspx.vb

Code:
Partial Class _Default
Inherits Page

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim i As Integer = 0
End Sub
End Class

I should also say that this is happening on a standalone dev box that is not part of a cluster.

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Web Forms :: Validation Of Viewstate MAC Failed / Left Inactive For More Then 20 Minutes

Aug 27, 2010

I have received an error "Validation of viewstate MAC failed".

I am hosting the web site on my own server, so there is nothing like a "Web Farm or cluster". Can you advise what could be the problem with this error.

I only get this error if the page is left inactive for more then 20 minutes and it throws the exception, so users have log-off and login to continue working fine.

See below full error details.

[code]....

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Web Forms :: Validation Of Viewstate MAC Failed / An Unhandled Exception Occurred

Jul 6, 2010

my 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.

[code]....

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Web Forms :: Validation Of Viewstate MAC Failed Error After Uploading To Web Server?

Oct 21, 2010

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.

<authentication mode="Forms">
<forms timeout="540" slidingExpiration="true" loginUrl="~/maintain/login.aspx" />
</authentication>

[code]...

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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.

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

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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?

If I revert back to the original master, the error disappears and I'm able to validate form fields. Both masters are located in the same path.

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

<% Html.RenderAction("menu", "nav"); %>

is creating the problem. The directive asks the "menu" action of the controller "nav" to inject a partial view Menu.ascx. If I delete this line from the new master page, everything works OK. My app's left bar navigation relies on this directive to work properly. Is there any way I can get around this?

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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:

Validation of viewstate MAC failed

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.

I assume it can be session timeout problem, but don't know how to deal with it.

View 1 Replies

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:

Error: 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. Source File: http://www.MyComp.com criptResource.axd?d=zNx0Fk9xi1ETKBw_Fc9MJ3a9Kp9CNPrHQDabGthwzSh32Wkw_OzriOYrMMZHyFSHnzqpp01wziW_tN0f9jEcZnJcMuTjBAcDB3ptDE0FILLyGwC956G8jI5pQ19F3beEYg0dkW9A9W-jBl1ZBsRms11V-vdOFaHdfpkaWww0H0tuL7am4AbVTa36mnOyWkDq0&t=2610f696 Line: 1508

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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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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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Web Forms :: Determine If User Clicks Open / Save Or Cancel On A File Download?

Dec 21, 2010

I have a webpage that allows a user to download a specified file. When the file is ready to be fully downloaded (i.e I call the HttpResponse.End or HTTPRepone.Flush) the user is presented with a File Download dialogue.

Is there any way to determine what option the user has selected?

Have they Opened, Saved or Cancelled the File Download once the Flush or End has been sent?

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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:-

how i can proceed on this error so that i will apply the fix in the webserver.

Error Details:

[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.

View 7 Replies

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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