Padding is invalid and cannot be removed

Posted by Ajay on Stack Overflow See other posts from Stack Overflow or by Ajay
Published on 2010-06-03T08:19:38Z Indexed on 2010/06/03 8:24 UTC
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Filed under:

mac

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validation

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viewstate

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pooling

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failed

I have hosted an asp.net 2.0 site. Everyday, i am getting an error "Padding is invalid and cannot be removed" 2-3 times. Backend used is sql server 2005. the site is controlled via plesk 9.2 CP.

Pooling is enabled with timeout as 120 Minutes, in IIS. Can it be the reason for this? I have not used any encryption except for the stored passwords(MD5)

The error message is : " Base Exception = : Padding is invalid and cannot be removed. - Source : System.Web - TargetSite :Void ThrowError(System.Exception, System.String, System.String, Boolean)Message : 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. " & System Log (Application) says " Event code: 4009 Event message: Viewstate verification failed. Reason: The viewstate supplied failed integrity check. Event detail code: 50203 ViewStateException information: Exception message: Invalid viewstate. Port: 31235 User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) "

I have hosted it in a dedicated server and not in a web farm. Will keeping a static machine key help resolve this issue?

Please guide me on this.

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