Skip to main content

A solution for error "Validation of viewstate MAC failed"


This is not the first time I have faced this error. I have faced this issue many times in my development career. However, today I got this error on one of my developed live site and hence I have decided to make a post.
The full message of this error reads “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.“
This is a common error which can be found on IE 6 or lower version browsers, when any web page gets idle for more than 20 minutes or so.
To resolve this issue, only you need to do is to set the page directive in your web.config file with following attributes.
<pages enableEventValidation=”false” validateRequest=”false” viewStateEncryptionMode=”Never” enableViewStateMac=”false”>

Comments

Post a Comment

Popular posts from this blog

ASP.NET MVC - Set custom IIdentity or IPrincipal

Here's how I do it. I decided to use IPrincipal instead of IIdentity because it means I don't have to implement both IIdentity and IPrincipal. Create the interface interface ICustomPrincipal : IPrincipal { int UserId { get ; set ; } string FirstName { get ; set ; } string LastName { get ; set ; } } CustomPrincipal public class CustomPrincipal : ICustomPrincipal { public IIdentity Identity { get ; private set ; } public bool IsInRole ( string role ) { return false ; } public CustomPrincipal ( string email ) { this . Identity = new GenericIdentity ( email ); } public int UserId { get ; set ; } public string FirstName { get ; set ; } public string LastName { get ; set ; } } CustomPrincipalSerializeModel - for serializing custom information into userdata field in FormsAuthenticationTicket object. public class CustomPrincipalSerializeMode...
8 comments
Read more

Validate credit card number with Mod 10 algorithm in C#

Introduction All you know what information contains in your NIC number. But do you know what information contains in the Credit Card Number? Following article provides brief details about what information contain in your credit card and demonstrates to how to validate credit card number using mod 10 (Luhn) algorithms with C#. Background  Card Length   Typically, credit card numbers are all numeric and the length of the credit card number is between 12 digits to 19 digits.  14, 15, 16 digits – Diners Club 15 digits – American Express 13, 16 digits – Visa 16 digits - MasterCard   For more information please refer  http://en.wikipedia.org/wiki/Bank_card_number . Hidden information  Major Industry Identifier (MII)   The first digit of the credit card number is the Major Industry Identifier (MII). It designates the category of the entry which issued the card.     1 and 2 – Airlin...
1 comment
Read more

How to Scroll to an Element with Javascript

  Overview Scrolling to a specific element or part of a webpage is mainly done to keep a user intact with the webpage for a longer period. A scroll is a function that can be used also to scroll to the beginning of a webpage from the bottom of the webpage instantly. Instant scrolling functionality is done or implemented using JavaScript. Scrolling to a particular section of a webpage adds a single-click functionality without much intervention from the user. There are different JavaScript scroll to element methods that are used to implement the functionality of scrolling to a particular element. These methods include: JavaScript  scrollIntoView  method. JavaScript  scroll  method. JavsScript  scrollTo  method. In this article, we will understand them thoroughly. Introduction Before learning about the JavaScript scroll to element, Let's learn a bit about JavaScript. JavaScript  is an object-oriented programming language used on web pages. JavaScript ...
Post a Comment
Read more