Exception on captchaimage.ashx. My fault?

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12/14/2009 5:41:12 AM
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Exception on captchaimage.ashx. My fault?

Hi, in the application log i notice this exception on captchaimage.ashx

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 14/12/2009 12.23.55
Event time (UTC): 14/12/2009 11.23.55
Event ID: ed93c0ac1cc8438f93c6ce037b384822
Event sequence: 5
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/479084390/Root-1-129052633498125000
Trust level: Full
Application Virtual Path: /
Application Path: ***\****\
Machine name: SERVERINO

Process information:
Process ID: 940
Process name: w3wp.exe
Account name: NT AUTHORITY\SERVIZIO DI RETE

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

Request information:
Request URL: http://***/CaptchaImage.ashx?spec=74GfOprjmBvAn unhandled exception has occurred.BQZYG5yQGXTl8hYZAn unhandled exception has occurred.BAnontBeVADNnyunvTST09b2iVpORQfHinfNY
Request path: /CaptchaImage.ashx
User host address: 61.247.222.83
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\SERVIZIO DI RETE

Thread information:
Thread ID: 1
Thread account name: NT AUTHORITY\SERVIZIO DI RETE
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 Subkismet.Captcha.CaptchaBase.DecryptString(String encryptedEncodedText)


Custom event details:

Per ulteriori informazioni, consultare la Guida in linea e supporto tecnico all'indirizzo http://go.microsoft.com/fwlink/events.asp.

It's my fault?

Mojoportal runs well on my w2k3 server, and the captcha does not get error

12/15/2009 7:17:43 AM
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Total Posts 18439

Re: Exception on captchaimage.ashx. My fault?

I see these errors occasionally in my log and I attribute them to crawlers poking around, I have not correlated it to any real users getting errors in the UI.

Best,

Joe

12/15/2009 7:23:51 AM
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Total Posts 251

Re: Exception on captchaimage.ashx. My fault?

yes, in fact i saw that that ip address is from a bot of the korean search engine naver

maybe i should ban them, i read that they ignore the robots.txt and crawl specifically in forbidden directories

visits from a successful search from naver: 0 Tongue out

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