以下是最常见的：

填充无效，无法删除。
说明：在执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其在代码中的起源位置的更多信息。

Exception Details:
System.Security.Cryptography.CryptographicException:
Padding is invalid and cannot be
removed.

Source Error:

An unhandled exception was generated
during the execution of the current
web request. Information regarding the
origin and location of the exception
can be identified using the exception
stack trace below.

Stack Trace:

[CryptographicException: Padding is
invalid and cannot be removed.]
System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[]
inputBuffer,Int32 inputOffset,Int32
inputCount,Byte[]& outputBuffer,
Int32 outputOffset,PaddingMode
paddingMode,Boolean fLast) +1545747
System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[]
inputBuffer,Int32
inputCount) +257
System.Security.Cryptography.CryptoStream.FlushFinalBlock()
+30 System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean
fEncrypt,Byte[] buf,Byte[] modifier,
Int32 start,Int32 length,Boolean
useValidationSymAlgo) +164
System.Web.UI.Page.DecryptString(String
s) +83
System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext
context) +148
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+358 System.Web.HttpApplication.ExecuteStep(IExecutionStep
step,Boolean& completedSynchronously)
+64

这发生在对特定WebResource.axd请求的请求。

我们看到的另一个错误是：

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. Description: An
unhandled exception occurred during
the execution of the current web
request. Please review the stack trace
for more information about the error
and where it originated in the code.

Exception Details:
System.Web.HttpException: 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.

发布表单时偶尔会出现此错误。

现在在你跳进去，告诉我这个错误的明显(通常)答案，考虑这：

>应用程序部署到IIS6上的Windows Server 2003
>它不在Web场。此处仅使用一个网络服务器。
>应用程序池标识是一个自定义服务帐户，我运行aspnet_regiss -ga< username>在服务器上。没有效果。