Webtest fails with the "231|error|500|Validation of viewstate MAC failed" error

Question

Hi

When i Record a webtest and play back then my web test fails with the following error in the response

 "231|error|500|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.|"

When i check in the Details tab the error message is "No hidden fields wer found in the Response"

Can some one help me with a fix?

Note:  Working on VS2008 with sp1  installed.

Thanks

-Charu

Answer 1

Hello Charu,

Based on the error message, it seems the web test is not able to find the viewstate and we have to extract it manually with extraction rule. You may refer to this post to see if you can have it resolved.

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