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Get exception error if logged in user is inactive...???

Posted By:      Posted Date: October 06, 2010    Points: 0   Category :ASP.Net
 

 hi,

If a logged in user is inactive on the page for more than 20 minutes and then

clicks a button to cause post back they get the  error below.

 

Server Error in '/' Application.

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.

 

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: 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

 

 

Is there a way to prevent this and Instruct them to log in again??


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