Error : Validation of viewstate MAC failed.

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hello sir i host a website in subdomain

demoweb.asgraphicsnext.com

when i open this website after 10 minute coming error in my website

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.

please give me some solution how to fix this error.
hosting company : microhost.com

Posted 8-Dec-15 0:33am

sachin p8d

Updated 8-Dec-15 23:03pm

koolprasad2003

v3

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Suvendu Shekhar Giri 8-Dec-15 7:02am

Anything tried from web help?
Check these-
Validation of viewstate MAC failed[^]
Validation of viewstate MAC failed.[^]
http://stackoverflow.com/questions/1418233/setting-viewstateuserkey-gives-me-a-validation-of-viewstate-mac-failed-error[^]

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Praveen_P · Answer 1 · 2015-12-08T01:13:00

Hi,

you can generate machine key using various online tools and place that code inside <system.web> element of web.config

for example

C#

<system.web>
<machineKey 
  validationKey="9D5525FFA8AB85DEB5CB3C002E2E07B4E5CB7A420CF795C3B53392FB1EC0DFC3D589A903634AD5D02F9A61990703D05509D17AA568EB3405C9373C11CD3097CC"
  decryptionKey="A7CB97DA5CA1F2DDD782476D821EDC3BE87C6ABA2F23E728348B06E13DD77694"
  validation="SHA1" decryption="AES"/>
</system.web>

Sanjeev Maurya · Answer 2 · 2015-12-08T01:16:00

C#

generate a <machineKey> element and update in web config file and your issue will be solved

C#

You can generate machine keys from the IIS manager

XML

The value is stored locally in the web.config of that application something like

<?xml version="1.0" encoding="UTF-8"?> 
<configuration> 
    <system.web> 
        <machineKey decryptionKey="F6722806843145965513817CEBDECBB1F94808E4A6C0B2F2,IsolateApps" validationKey="C551753B0325187D1759B4FB055B44F7C5077B016C02AF674E8DE69351B69FEFD045A267308AA2DAB81B69919402D7886A6E986473EEEC9556A9003357F5ED45,IsolateApps" /> 
    </system.web> 
</configuration>

please go through this website https://blogs.msdn.microsoft.com/vijaysk/2009/05/13/iis-7-tip-10-you-can-generate-machine-keys-from-the-iis-manager/[^]

koolprasad2003 · Answer 3 · 2015-12-08T17:26:00

Solution 3

Your application pool get recycle after 10 minutes and that's why application throws error
you need to create a new application pool and assign to your web application, check out below link for more detail
https://support.microsoft.com/en-us/kb/2915218[^]

Posted 8-Dec-15 17:26pm

koolprasad2003

Error : Validation of viewstate MAC failed.

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