Validation of viewstate MAC failed.

Question

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Hello friends,

I have uploaded my web site on my domain it works fine for all features but when i try to register new member it shows the following error.

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.

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.

Can anybody guide to solve this error.

Thanks in advance.

Posted 29-Jan-12 22:26pm

saj_21

Updated 15-Dec-22 23:02pm

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Comments

Sudip Saha 30-Jan-12 4:44am

Can you please host the site in different application pool If your application pool using by many web site then that kind of problem happening

saj_21 30-Jan-12 4:51am

I have created a virtual directory on my web server and i have hosted this site in that virtual directory.

I have one doubt :- can single domain have multiple application pools and if yes then how can i host the site in different application pool.???

6 solutions

Solution 5

Put this code in webconfig..

HTML

<machinekey validation="SHA1" validationkey="A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1B2C3D4E5" decryption="Auto" decryptionkey="A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1" />

Posted 6-May-14 19:51pm

RajeeshMenoth

Comments

Sanket Saxena 7-May-14 2:24am

isnt it u are very late. This is 2 yr old question.

[no name] 7-May-14 2:38am

i am created code project account few months back thats y i didnt se thiz...

Sanket Saxena 7-May-14 2:41am

ahh ok no issue i think so thats why i didnt downvoted buddy... happy coding :)

Codes DeCodes 4-Jun-14 1:13am

can we simply copy and paste machinekey elements or does .net framework matters..

Solution 7

Paste in web config.
<system.web>
<machinekey validationkey="1234567890123456789012345678901234567890AAAAAAAAAA">
decryptionKey="123456789012345678901234567890123456789012345678"
validation="SHA1" decryption="Auto" />

Posted 11-Jan-15 20:03pm

Er. Anil Yadav

Solution 9

this Happened when i tried to connect from my IIS using windows Authentication
to solve this issue create user in SQL and change the connectionString to login with this user

Posted 2-May-18 23:32pm

hessenaladawy

Solution 10

Locate the appropriate directory, depending on whether your application pool is 32-bit or 64-bit:

32-bit application pool: cd /d %windir%\Microsoft.NET\Framework\v4.0.30319

64-bit application pool: cd /d %windir%\Microsoft.NET\Framework64\v4.0.30319

Move to the directory, type the following command, and then press Enter:

aspnet_regiis -ga "IIS APPPOOL\app-pool-name"

Posted 15-Dec-22 23:02pm

Spiros R Karasavvas

Comments

Richard Deeming 16-Dec-22 8:11am

Absolutely nothing to do with the question, which was solved nearly 11 years ago.

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

saj_21 · Accepted Answer · 2012-01-30T01:18:00

Solution 1

I have solved this.

need to add a machinekey in webconfig
http://www.orcsweb.com/a...es/aspnetmachinekey.aspx

ASP.NET machineKey Generator[^]

Posted 30-Jan-12 1:18am

saj_21

Updated 28-May-12 9:50am

v2

Comments

Maria Norbert 31-Oct-13 7:27am

Can you say the reason for this error in detail..?

What is the need to add a Machine Key..?

Member 12320117 11-Feb-16 1:42am

how to use machinekey on my windows 7 pro sp1

Fenil Desai · Accepted Answer · 2012-12-10T17:51:00

Solution 3

adding the below code in the web.config had fixed the issue for me.

C#

<pages enableeventvalidation="false" viewstateencryptionmode="Never"></pages>

Posted 10-Dec-12 17:51pm

Fenil Desai

Updated 10-Dec-12 17:52pm

v3

Comments

Damilola Kolawole 21-Nov-14 5:21am

The code is case sensitive, the correct version is written below

<pages enableEventValidation="false" viewStateEncryptionMode="Never"></pages>

sasi_B 2-Jul-15 5:42am

But I want to know will be there any security issues?

Validation of viewstate MAC failed.

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Validation of viewstate MAC failed.

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