'Unable to validate data', 'Authentication of viewstate failed', 'Invalid_Viewstate'

I' trying to run my web application locally. These are the erros I get on the first postback. However, the initial load works ok.

The same web application works fine on a remote server.
Iv'e downloaded the .NET1.1 SP1, as it fixes some problems similiar to mine.
However the installation has encountered an error, and asked me to debug it. (Funny)
So I cancled it, but regretfuly XP update treats it like it's installed. Not sure it is, not sure it isn't, not sure if it'll even help..
Here's the stack trace:
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60
[HttpException (0x80004005): Authentication of viewstate failed. 1) If this is a cluster, edit <machineKey> configuration so all servers use the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. 2) Viewstate can only be posted back to the same page. 3) The viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +118
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +101
[HttpException (0x80004005): Invalid_Viewstate
Client IP: 84.94.63.42
Port: 12512
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
ViewState: dDwtMTc2MTg1NzgxNzt0PDtsPGk8MT47PjtsPHQ8O2w8aTwzPjtpPDExPjs+O2w8dDw7bDxpPDA+Oz47bDx0PHQ8cDxwPGw8QXV0b1Bvc3RCYWNrOz47bDxvPHQ+Oz4+Oz47Oz47Oz47Pj47dDw7bDxpPDA+O2k8MT47PjtsPHQ8dDxwPHA8bDxFbmFibGVkO1Zpc2libGU7PjtsPG88Zj47bzxmPjs+Pjs+Ozs+Ozs+O3Q8cDxwPGw8RW5hYmxlZDtWaXNpYmxlOz47bDxvPGY+O288Zj47Pj47Pjs7Pjs+Pjs+Pjs+Pjs+UxM6ABKCSrdSyYxEN+bWAV77JSE=
Http-Referer: http://localhost/WebApplication1/default.aspx
Path: /default.aspx.]
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +442
System.Web.UI.Page.LoadPageViewState() +18
System.Web.UI.Page.ProcessRequestMain() +447

If you have any thought or solution for this, do not hesitate..

0
dr0r
1/19/2005 12:40:43 PM
asp.net.installation-setup 5668 articles. 1 followers. Follow

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Hello,

Looks like your view state is going titsup. This happens once in aboutt 20,000 normal page views anyway but you shouldn't be getting it all the time. Try turning of all the view states on the object you don't need to keep in updated in the page. Also another thing to keep in mind the view state keeps an incoded MAC address of the computer that ran it so if you've used a different computer and copied the ViewState over to a new page that is being run on a different computer you will get this error.
Make sure the raw HTML of you page does not have the "__VIEWSTATE" tag in it before you run it.
hope this helps
-Wenham
0
wenham
2/1/2005 11:27:32 AM
Reply:

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