Very very urgent: WebForms.PageRequestManagerServerErrorException error only on one computer

Question

Hi,

I have developed a web application using .net framwork 4.0 and asp.net 4. I have used AJAX controls in all my web pages. The application works fine on all computer. But only one computer gives following error I have used UpdatePanel control to make an AJAX call:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Sat, 12 May 2012 10:57:12 UTC

Message: Sys.WebForms.PageRequestManagerServerErrorException: 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.
Line: 4723
Char: 21
Code: 0
URI: http://localhost/LotCleaning/ScriptResource.axd?d=pPbs3WYTb1xz3E4d4uQ1JTgR0C_d4qtDmIjoJeOLWIIds8H61BCRNtqhfwArk7J7DVWmLSVbqh_5hS7OUXrBhWsig32hFB8X24VuHqQNAGuJoNl-hsTH2ctnnUJXEHb5MoWy29NamUKtIVYmAMB4d9qArPUrpXDWeailxqj7cgHMMh_90&t=fffffffff9d85fa6

Message: Sys.WebForms.PageRequestManagerServerErrorException: 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.
Line: 4723
Char: 21
Code: 0
URI: http://localhost/LotCleaning/ScriptResource.axd?d=pPbs3WYTb1xz3E4d4uQ1JTgR0C_d4qtDmIjoJeOLWIIds8H61BCRNtqhfwArk7J7DVWmLSVbqh_5hS7OUXrBhWsig32hFB8X24VuHqQNAGuJoNl-hsTH2ctnnUJXEHb5MoWy29NamUKtIVYmAMB4d9qArPUrpXDWeailxqj7cgHMMh_90&t=fffffffff9d85fa6

Message: Sys.WebForms.PageRequestManagerServerErrorException: The state information is invalid for this page and might be corrupted.
Line: 4723
Char: 21
Code: 0
URI: http://localhost/LotCleaning/ScriptResource.axd?d=pPbs3WYTb1xz3E4d4uQ1JTgR0C_d4qtDmIjoJeOLWIIds8H61BCRNtqhfwArk7J7DVWmLSVbqh_5hS7OUXrBhWsig32hFB8X24VuHqQNAGuJoNl-hsTH2ctnnUJXEHb5MoWy29NamUKtIVYmAMB4d9qArPUrpXDWeailxqj7cgHMMh_90&t=fffffffff9d85fa6

Answer 1

Sorry, but this is the wrong forum (this one is for forum profiles). You can try...

www.forums.asp.net

http://msdn.microsoft.com/en-us/netframework/aa569260

Thanks!

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Ed Price (a.k.a User Ed), SQL Server Experience Program Manager (Blog, Twitter, Wiki)