Viewstate MAC failure message

Question

0.00/5 (No votes)

See more:

After hosting a web site, when accessing two or more members at a time, I get 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.

Any help with this, is greatly appreciated.

Posted 5-Apr-12 23:16pm

kvns2608

Updated 6-Apr-12 0:02am

Slacker007

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

sjelen · Answer 1 · 2012-04-06T00:20:00

Solution 1

You can turn off this validation by adding EnableViewStateMac="false" to your page directive.
The real question is what's causing the error and you didn't provide much info.

Posted 6-Apr-12 0:20am

sjelen

Updated 6-Apr-12 6:57am

v2

Mukund Thakker · Answer 2 · 2012-04-06T20:04:00

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" /></machinekey>