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What causes invalid viewstate errors?

Author

Christopher Duran

Updated on March 02, 2026

What causes invalid viewstate errors?

This error is usually caused by the asp worker process or the server recycling. By default, ASP.NET encrypts the viewstate using an Autogenerated Key when the process spins up. The problem comes when a client (browser) sends the request with a viewstate encrypted with the key generated by another worker process.

Hereof, what is a viewstate error?

If the size of a particular page exceeds 135kb, the page will throw a view state error. A screenshot showing a view state error in salesforce. To check the view state of a visual force page you have to make sure that Show View State in Development Mode checkbox in the User Layout is checked.

Furthermore, how do I enable EnableViewStateMac false? All versions of the ASP.NET runtime 1.1 – 4.5. 2 now forbid setting <%@ Page EnableViewStateMac=”false” %> and <pages enableViewStateMac=”false” />. If you have set EnableViewStateMac=”false” anywhere in your application, your application will be affected by this change and you should read on.

Likewise, people ask, how do I fix validation viewstate failed MAC?

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.

How do I stop viewstate error?

In order to reduce the view state, make use of the following:

  1. "Transient" keyword - to declare instance variables that can't be saved, and shouldn't be transmitted as part of the view state for a VF page.
  2. Minimize the number of forms i.e <apex:form> on a page.
  3. Refine your SOQL to retrieve only the data needed.

What is viewstate in Salesforce?

What is view state in salesforce? ViewState holds state of the visualforce page that holds state that includes the fields, components and controller state. Viewstate data in encrypted and cannot be viewed tools like firebug. There is a limit of 135KB of view state.

How do I display my username in Visualforce page?

1 Answer
  1. Reference the Account Name from the $User Visualforce global variable. {!$User.Contact.Account.Name}
  2. If that doesn't work, create a new formula field on the User object named Contact Account Name with this formula: Contact.Account.Name .

What is viewstate VF page?

ViewState holds state of the visualforce page that holds state that includes the fields, components and controller state. Viewstate data in encrypted and cannot be viewed tools like firebug. – Stores Objects that are reachable from a non-transient data member in a controller or extension.

What is transient variable in Salesforce?

Transient Variable in Sales force: Transient keyword to declare instance variable that can not be saved and should not transmitted as part of view state for visual force page. View state maintains state of the Database between request and visual force page.

How do I view viewstate in Salesforce?

View State Tab
  1. From your personal settings, enter Advanced User Details in the Quick Find box, then select Advanced User Details. No results?
  2. Click Edit.
  3. Select the Development Mode checkbox if it isn't selected.
  4. Select the Show View State in Development Mode checkbox.
  5. Click Save.

What is 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. Invalid viewstate.

How do I generate a machine key?

To do this, please follow these instructions:
  1. Go to IIS console on one of the webservers > Sites > select the Pyramid website > double-click on Machine Key icon in center pane.
  2. In Machine Key dialog, click on Generate Keys and then Apply.
  3. Copy the generated validation and decryption keys to the notepad.

What is web config file in IIS?

The web. config is a file that is read by IIS and the ASP.NET Core Module to configure an app hosted with IIS.

How can we store and retrieve values view state?

If you need to store extraneous information in ViewState, you can get and set data in ViewState like you would any other key/value collection: //store value in viewstate ViewState["someValue"] = "Foo"; //retrieve value from viewstate string someValue = ViewState["someValue"]. ToString();

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.

What is the purpose of EnableViewStateMac in asp net?

Using enableViewStateMac requires that successive requests be forwarded to the same server (i.e. server affinity). This feature is used to help prevent tampering of a page's view state; however, it does so based on an auto-generated validation key on the current server.

What is ViewStateEncryptionMode?

The ViewStateEncryptionMode enumeration provides values for specifying whether the view-state information in a Page object is encrypted. The ViewStateEncryptionMode value can be set only in the @ Page directive or in the section of the configuration file.

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