Hi,

Every day google, yahoo and bing bots crawl our site and causes a lot of exceptions being throwned. All these exceptions makes the site go down and we have to ask our web host to clear the .Net chache and restart the app pool. The two following erorrs are:

"Event ID: 4187
Event type: Error
Event time: 4/8/2011 8:14:15 PM
Source: Application_Error
Event code: EXCEPTION
User ID: 65
User name: public
IP address: 66.249.67.227

Description: Message: Length of the data to decrypt is invalid.
Stack Trace:
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, IVType ivType, Boolean useValidationSymAlgo)
at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType)
at System.Web.UI.Page.DecryptString(String s)

Site name: site
Machine name: VENOM
Event URL: /ScriptResource.axd?d=jZJkR9OGWSRKNyKFVUTyoKXK9rlmh5iZl3G7DA6UYeObtbVvSUH_ck9r1QNIIeRxrFihFKBN2ZSx4418TjyPX4FQqsoYbA8VZt6_YUkAGIPFMEOr1bI2WuIxahgqpoBGLN6GDDXfW2dpa47RSaO-_OSudw2euSPyo9HBlOShd9f5y6Hu0&t=ffffffffd44210f8
URL referrer:
User agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"


and

"Event ID: 4233
Event type: Error
Event time: 4/9/2011 5:27:07 AM
Source: Application_Error
Event code: EXCEPTION
User ID: 65
User name: public
IP address: 66.249.67.218

Description: Message: Padding is invalid and cannot be removed.
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, IVType ivType, Boolean useValidationSymAlgo)
at System.Web.UI.Page.DecryptStringWithIV(String s, IVType ivType)
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)

Site name: site
Machine name: VENOM
Event URL: /WebResource.axd?d=w7Y4NZGuwrbjFk-7D62R-g2&t=634105738304687500
URL referrer: oursite
User agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

How can we get rid of these annoying errors?


Thanks in advance.