Generate Machine Key:

If you sick of getting this error:

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Maybe it is time to specify a machine key... just paste this into your web.config file inside the <system.web> tag.

.net2.0
<machineKey validationKey="04D4AF8DA79F4119B80E380138C264DAA6A4394BCD5AD39DAD14775C51EC61845B5C92DD35A7E030356F461887338EE6728F79A844BDFD455197AC0C54D83ED7" decryptionKey="59848EB1E9B7A850BEAEC8E8EA722C6FE72B9A68AF13B2C3EECFEE33E5496253" validation="SHA1" decryption="AES" />
.net1.1
<machineKey validationKey="895A9B7B9E77BDACF335DD93C481E44BAE6A16CEBA10226598EBD231127D8A6BC0B48D75B5885478B7452B80725E33FBF1AB229254264AF67B0304A3BC424AFF" decryptionKey="AA8EB8C113108036B31A077FCA8552912D896FF9384D6D6A" validation="SHA1" />

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