How do I fix validation viewstate failed MAC?

[HttpException (0x80004005): 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.

What is machineKey validationKey?

The machineKey element in the ASP.NET web. config file specifies the algorithm and keys that ASP.NET will use for encryption. By default the validationKey and the decryptionKey keys are set to AutoGenerate which means the runtime will generate a random key for use. The value is stored locally in the web.

How do I enable EnableViewStateMac?

Set the EnableViewStateMac attribute using the @ Page directive in the . aspx file. When the page is requested, the dynamically generated class sets the property. This attribute should never be set to false in a production Web site, even if the application or page does not use view state.

Where is machine key stored?

Windows has a cryptographic key store, and it is simply located in a folder on your hard drive. On my Windows 10 machine, this path is C:\ProgramData\Microsoft\Crypto and inside that folder, there are various other folders for each key type. In this example, we will be looking at the RSA\MachineKeys subfolders.

What is the machine key?

A machine key tightly secures gears, cams, sprockets, pulleys and other parts to the drive shaft in a power transmission and transmits torque from the main shaft to connected parts.

What is machine key in web config?

Machine key a unique key that differentiates one computer from others. And this key is used to create unique identifier when cookie is created in the client machine from a server side code. This key is generally present in the machine. config file when you install .

What should I do if my VIEWSTATE Mac failed?

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.

How to fix ASP.NET validation of VIEWSTATE Mac?

Close the dialog box and right-click your website and select Advanced Settings… from the Manage Website option of the content menu. In the dialog box, under General section, make sure you have selected the proper name of the Application Pool to be used. Your website should now run without any problem. Hope this helps you overcome this error.

What is an example of a Mac validation error?

A MAC validation error will resemble the following example: Server Error in ‘/’ Application. 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.

What do you need to know about view state Mac?

The view state MAC helps ensure the security of other ASP.NET functions in addition to view state.” Please Sign up or sign in to vote. The content must be between 30 and 50000 characters. … Download, Vote, Comment, Publish.

How do I fix validation viewstate failed MAC? [HttpException (0x80004005): 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. What is machineKey validationKey? The machineKey element in the ASP.NET web. config file specifies the algorithm and keys…