I'm getting an error in the event viewer as well as a script error in the
browser when a page references WebResource.axd.  The application is running
on W2k3 server and does not occurr on my local xp development machine.

Has anyone encountered this?

Event Type: Warning
Event Source: ASP.NET 2.0.50727.0
Event Category: Web Event
Event ID: 1309
Date:  1/5/2006
Time:  11:00:17 PM
User:  N/A
Computer: 216-55-185-220
Description:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 1/5/2006 11:00:17 PM
Event time (UTC): 1/6/2006 7:00:17 AM
Event ID: 9154807ea7364b0ba0db45c2a4f2eb90
Event sequence: 43
Event occurrence: 6
Event detail code: 0

Exception information:
    Exception type: CryptographicException
    Exception message: Padding is invalid and cannot be removed.

Thread information:
    Thread ID: 1
    Thread account name: 216-55-185-220\MyStreakASP
    Is impersonating: False
    Stack trace:    at
System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[]
inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer,
Int32 outputOffset, PaddingMode paddingMode, Boolean fLast)
   at
System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[]
inputBuffer, Int32 inputOffset, Int32 inputCount)
   at System.Security.Cryptography.CryptoStream.FlushFinalBlock()
   at
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean
fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean
useValidationSymAlgo)
   at System.Web.UI.Page.DecryptString(String s)
   at
System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext
context)
   at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)

I'm dealing with the same problem right now.  I'm pulling my hair out.
Any luck finding a solution?

Me too ... any update?

Thanks

Nothing here...  still haven't corrected the issue.

My issue was that I had an http module that performed an SSL redirect
based on page name and webresource.axd was not being requested from the
same url or something ... anyhow, I am going to have to cross this
bridge again since SSL vs non-SSL redirects is common between pages on
the site.

Microsoft considers this problem resolved, yet I've seen multiple
instances of it occuring with other people on non-webfarm sites:

http://lab.msdn.microsoft.com/ProductFeedback/viewFeedback.aspx?feedbackid=17c64976-ee21-4055-9de4-992d9c59e589

Tis quite annoying.  Currently I've modified my web.config so that I
can actually develop and test my site without this problem killing my
sessions.  But my site probably has some security hole that I'm not
going to tackle just yet.

I've finally found a solution, and it is beautiful, but also completely
frustrating at the same time.  Long story short, it's the machineKey
element in the web.config.

Go here, to generate a validation key.
http://www.eggheadcafe.com/articles/GenerateMachineKey/GenerateMachineKey.aspx

By setting this value, you define a validation key that will match the
cookie and no more CryptographicException.  It worked beautifully for
me.  The frustrating part is that no one could tell us this simple
solution.

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