Hi Experts,
I have received an error "Validation of viewstate MAC failed".
I am hosting the web site on my own server, so there is nothing like a "Web Farm or cluster". Can you please advise what could be the problem with this error.
I only get this error if the page is left inactive for more then 20 minutes and it throws the exception, so users have log-off and login to continue working fine.
See below full error details.
Server Error in '/datacapv2' 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 ...
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