Im getting d following error.I've read various forms and cannot understand the reason for this issue. 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 getting this error when i submit form...
Why this error coming and how to solve it...
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?
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" />
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 -
Webpage error details
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)
Timestamp: Wed, 28 Apr 2010 07:39:24 UTC
Message: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
Line: 4723
Char: 21
Code: 0
URI: http://www.shoeslocation.com/ScriptResource.axd?d=w3IpLZb6A3e5QHkk7kOTg4vdE8qw_8oIJ-6Kv5NpYYlCqyodfByoMbMvCI7RsUpH3U_p3tMqnuLd_nCq_qPaX4weg2w6s1FlfA_eQbVY-nU1&t=55414254
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"
I've got a view model that has some text properties. And I use Html.DisplayFor to display them on the screen. But those text data won't be post back, so in the case of failed validation, the returned view won't have those data. How do I handle this kind of situation?
View 2 Repliesthis 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.
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.
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"/>
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?
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]....
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.
I am using tabstrip control. each tab page have set of controls and each have different validation group. I have a common button to insert / update the tab datas. Now when a user entered the information in the first tab and press insert button, i need to validate second page also.
So i explicitely called Page.validate() metyhod in the insert button to ensure all the validation passed or not. All working fine. But i need to focus the second tab when user finished first page and not finished ssecond page. How can i focus the tab. I mean any way to check which validation group fails?
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.
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]....
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]....
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]...
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.
I want to open FolderBrowserDialog,
I am getting error as
"Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process."
Then I added
System.Threading.Thread.CurrentThread.SetApartmentState(System.Threading.ApartmentState.STA)
And I got error as "Failed to set the specified COM apartment state."
Here is code
Private Sub btnBrowse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim MyFolderBrowser As New System.Windows.Forms.FolderBrowserDialog
' Description that displays above the dialog box control.
System.Threading.Thread.CurrentThread.SetApartmentState(System.Threading.ApartmentState.STA)
MyFolderBrowser.Description = "Select the Folder"
[Code] ....
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.
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?
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?
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">
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.
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
