Validation of viewstate mac failed load balancer




By default ASP.

Solution 3

NET will generate this Encryption Key between the Client and Server upon each request so the communication follows a secure path. However in a scenario where we are using multiple Web Servers or a Web Farm, this can lead to the following error:.

This is due to the way that the View State may be being generated against one Web Server using a particular Encryption Key and then reposted to a different Web Server that is using a separate and different Encryption Key — leading to an error between the two different Encryption Keys as the key in use at the Client may not match the Key at the Server in this Load Balancing arrangement. The resolution to this is similar to ensuring Session State is consistent when using Load Balancers and Web Farms — ensuring that a common Encryption Key exists between both Servers A and B, giving us a single key that both A and B use to manage Viewstate to make which Server the User is requesting from irrelevant.

How do we do this? To put this common key in place, we need to run through two steps:. Generate the Key — we access Powershell on the selected Server and run the following command:.

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How do we fix the ‘Validation of Viewstate MAC failed’ error

This will generate a new Encryption Key in the form that can be used in our Web Application. Insert this key into our Web Application — we then need to access the Web. With these two steps in place, the Web Servers should share the same Encryption Key for Viewstate and so this error should no longer occur. Further Reading. The links below give a more detailed set of information on this topic.

Solution for ‘Validation of viewstate MAC failed’

AutoGenerate cannot be used in a cluster. 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: Why would this error be occuring?

Solution 2

It might be worth noting, this error never occurred on the old server. Curt Curt 1 8.


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See the following link for more information: Kev Kev 6, 12 65 Reading through this article I can see I need to run a function to return crypted values. However what value would I pass as the parameter for: ByVal argv As String?

How do we fix the ‘Validation of Viewstate MAC failed’ error

If you do not specify an argument, the code returns a hexadecimal character byte key. So does that mean I need to put App.


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