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...

Question

1.00/5 (1 vote)

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see the design code given below

ASP.NET

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="testpage.aspx.vb" Inherits="testpage" 
EnableViewStateMac="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head  runat="server">
<title>Untitled Page</title>

<script type="text/javascript">

function callme(frmname)
{
var myForm = document.forms[frmname];
myForm.submit();
}

</script>

</head>
<body>
<form id="frm1" method="post" style='margin-top: 0px; margin-bottom: -10px'  runat="server"
action="Default.aspx">
<div id="button2" style="float: left;" önclick="callme('frm1');">
<a style="removed: pointer" class="smallfnt3">Register Now</a>
</div>

</form>
</body>
</html>

it shows error as

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.

Please Help.

Posted 16-May-12 2:28am

Rakesh S S

Updated 16-May-12 2:29am

Prasad_Kulkarni

v2

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Comments

ZurdoDev 16-May-12 8:39am

When do you get the error? Just loading the page or posting back?

Mohamed Mitwalli 16-May-12 9:18am

when did it happen ?

Rakesh S S 16-May-12 13:12pm

the moment i click the div with id="button2"
it execute javascript and after that it shows the above error

3 solutions

Solution 2

This can be because of the 'action' attribute in your form tag. This error happen if you have specified an action on the forms element, and if the action is different than the page you are browsing to. Earlier, the action attribute was ignored. Remove the action attribute, or change it to post to the right page if you want to have viewstate enabled.

Details here: Validation of viewstate MAC failed after installing .NET 3.5 SP1[^]

Posted 16-May-12 3:26am

Sandeep Mewara

Comments

Rakesh S S 16-May-12 12:51pm

do i need to keep enable viewstate to false of this page
not getting your point

Sandeep Mewara 16-May-12 13:17pm

Which part was confusing?

2 options - pick one of them
1. Remove 'action' attribute in your forms tag. Make it: <form id="frm1" method="post" style='margin-top: 0px; margin-bottom: -10px' runat="server"> (See any difference? There was an action attribute which I removed)
2. If you keep 'action' attribute, Add the redirect page where you are going to. Looks like it's not "default.aspx". add the next page where the execution is going.

Wendelius 16-May-12 15:47pm

Good answer

Sandeep Mewara 16-May-12 15:53pm

Thanks Mika.

Rakesh S S 17-May-12 1:03am

i used master page
and form tag should be runat="server"
in order to place server control
and finally i need to use action attribute
work fine without runat server [form tag]
but not working with attribute runat

Sandeep Mewara 17-May-12 2:56am

Your posted question - html page design NEVER say/used a master page.

If you post something else in your question other than what you are facing, it gets much more difficult to help.

Rakesh S S 17-May-12 4:44am

same scenario of master page
i tried in normal aspx page for testing
as mentioned by @Dain Ucak need to remove runat=server
work for me

Solution 3

How to fix “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”

We were testing the deployment of a website onto 2 load balanced IIS 7 servers the other day, and the sites were loading fine. the next morning one of the testers was reporting an erorr on the website that said ”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” . We looked at the error and realised that we need to create a static machinekey and add it into the web.config of both our IIS7 web servers to fix the issue.

Add following code in web.config.

C#

<machinekey validationkey="AutoGenerate,IsolateApps" decryptionkey="AutoGenerate,IsolateApps" validation="SHA1" decryption="Auto" />

Posted 17-May-12 2:01am

Mukund Thakker

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Dain Ucak · Accepted Answer · 2012-05-16T02:57:00

Solution 1

if you remove your posted form runat server attribute it will work fine

<form id="frm1" method="post" style="margin-top: 0px; margin-bottom: -10px" runat="server">
action="Default.aspx"></form>

like this

<form id="frm1" method="post" style="margin-top: 0px; margin-bottom: -10px">
action="Default.aspx"></form>

Posted 16-May-12 2:57am

Dain Ucak

Comments

Rakesh S S 16-May-12 12:49pm

what if i got some server control inside form tag
i have make runat="server" in such scenario

Dain Ucak 16-May-12 13:09pm

if you dont use master page make this.

<form id="form1" runat="server">
put your server side tags here
</form>
<form id="frm1" method="post" style="margin-top: 0px; margin-bottom: -10px">
action="Default.aspx">....

Rakesh S S 17-May-12 0:37am

yes i am using master page

Dain Ucak 17-May-12 8:05am

yes you can use master page. if you have a problem and took any advice about those problems, you need to develop some difference scenario.

for example. you are using master page and you have a server side form tag in this master page. you can close your form tag in your content page and reopen form tag which isnt server side.
look my example. i tried to tell you clearly.
firs this is my master page code between body tag

<body>
<div id="Container" style="width:100%; position:relative;" align="center">
<div style="width:1000px; height:300px;">
<form id="form1" runat="server">
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">


</form>
<%
if(Request.RawUrl.Contains("testA.aspx")){
%>

</div>
<%} %>
</div>
</div>
</body>
now this is my testA.aspx which post to testB.aspx html codes
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
</form>
<script type="text/javascript">

function callme(frmname) {
var myForm = document.forms[frmname];
myForm.submit();
}

</script>
<div style="position:absolute; top:50px; left:450px;">
<form id="frm1" method="post" style='margin-top: 0px; margin-bottom: -10px' action="TestB.aspx">
<div id="button2" style="float: left; cursor:pointer !important; cursor:hand !important;" önclick="callme('frm1')">aaa
</div>

and look at testB.aspx
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

i hope this will help you

Amin Mou 10-May-13 16:00pm

tyyy :)