Validation of viewstate MAC failed error message

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SecureAuth IdP Version affectedAll

 

Description:
"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."

Cause:
This is a load balancer related issue. This is typically seen when a web application (SecureAuth IdP) is in a load balanced configuration and the session persistence is set to transient.

Resolution:

The solution is to verify/change load balancer session persistence handling to "sticky" or "IP Persistent".

 

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