ASP.Net Error: Validation of viewstate MAC failed.

on Oct 28, 2012 11:03 PM


Im getting d following error.I've read various forms and cannot understand the reason for this issue.Can you explain in a simple way what is the cause of this error and how to solve this?

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.

Download FREE API for Word, Excel and PDF in ASP.Net: Download
on Oct 28, 2012 11:13 PM