In this post we will discuss how to resolve the error "Validation of viewstate MAC failed" which sometimes comes in Asp.Net. Also you can check out some posts on:
- Repository pattern with code first approach in mvc4
- Constraints in SQL Server 2008
- Cookieless session in Asp.Net
Here is the full error mess
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.
Here the problem is with Machine Key field.
Solution:
Go to eggheadcafe Link and generate a Machine Key by click on the "Generate Me A Key!" button.
This will generate a Machine Key, Copy the whole thing and add it inside the <system.web> tag like below:
</system.web>
This should solve the issue.
- Repository pattern with code first approach in mvc4
- Constraints in SQL Server 2008
- Cookieless session in Asp.Net
Here is the full error mess
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.
Here the problem is with Machine Key field.
Solution:
Go to eggheadcafe Link and generate a Machine Key by click on the "Generate Me A Key!" button.
This will generate a Machine Key, Copy the whole thing and add it inside the <system.web> tag like below:
<system.web>
<machineKey validationKey='E87A9D557279F86C841F2BA9A777CF91609F31D5D8F0F2079D7C00AB6A21A2E930463BE860C18D4526CBCB94904593B30979DC43DA4D247F828BE95557C1CA25' decryptionKey='D17B35DFE5B1C60485A5964EAF154263DA1F95E4732B93DC' validation='SHA1'/>
This should solve the issue.
