System.Security .Cryptography.C ryptographicExc eption: Padding is invalid and cannot be removed.

[Amelyan]

Why does this happen? How to fix it?

Once in a while I get error in ~/ScriptResource. axd?d=...

System.Reflecti on.TargetInvoca tionException: Exception has been thrown by
the target of an invocation. --->
System.Security .Cryptography.C ryptographicExc eption: Padding is invalid and
cannot be removed.

at
System.Security .Cryptography.R ijndaelManagedT ransform.Decryp tData(Byte[]
inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer,
Int32 outputOffset, PaddingMode paddingMode, Boolean fLast)

at
System.Security .Cryptography.R ijndaelManagedT ransform.Transf ormFinalBlock(B yte[]
inputBuffer, Int32 inputOffset, Int32 inputCount)

at System.Security .Cryptography.C ryptoStream.Flu shFinalBlock()

at
System.Web.Conf iguration.Machi neKeySection.En cryptOrDecryptD ata(Boolean
fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean
useValidationSy mAlgo)

at System.Web.UI.P age.DecryptStri ng(String s)

--- End of inner exception stack trace ---

at System.RuntimeM ethodHandle._In vokeMethodFast( Object target, Object[]
arguments, SignatureStruct & sig, MethodAttribute s methodAttribute s,
RuntimeTypeHand le typeOwner)

at System.RuntimeM ethodHandle.Inv okeMethodFast(O bject target, Object[]
arguments, Signature sig, MethodAttribute s methodAttribute s,
RuntimeTypeHand le typeOwner)

at System.Reflecti on.RuntimeMetho dInfo.Invoke(Ob ject obj, BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean
skipVisibilityC hecks)

at System.Reflecti on.RuntimeMetho dInfo.Invoke(Ob ject obj, BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

at System.Reflecti on.MethodBase.I nvoke(Object obj, Object[] parameters)

at System.Web.Hand lers.ScriptReso urceHandler.Dec ryptString(Stri ng s)

at
System.Web.Hand lers.ScriptReso urceHandler.Dec ryptParameter(N ameValueCollect ion
queryString)

at System.Web.Hand lers.ScriptReso urceHandler.Pro cessRequest(Htt pContext
context)

at
System.Web.Hand lers.ScriptReso urceHandler.Sys tem.Web.IHttpHa ndler.ProcessRe quest(HttpConte xt
context)

at
System.Web.Http Application.Cal lHandlerExecuti onStep.System.W eb.HttpApplicat ion.IExecutionS tep.Execute()

at System.Web.Http Application.Exe cuteStep(IExecu tionStep step, Boolean&
completedSynchr onously)