Captcha Problems

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11/6/2009 10:51:29 AM
cmillens
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Captcha Problems

Downloaded the lastest off the source tree and I'm getting this now: 

2009-11-06 09:47:59,694 ERROR mojoPortal.Web.Global - 168.103.86.174-en-US - /CaptchaImage.ashx?spec=MFe%2bp%2f9SEsICfVw3%2fQBOViiGhMwzyGN%2fCZbzebzQVYulkMvsYp9BREklbXUhz2sO
System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed.
   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) in D:\__codelib\subkismet-14873\SubkismetSolution\Subkismet\Captcha\CaptchaBase.cs:line 53

11/6/2009 5:28:40 PM
Joe Audette
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Re: Captcha Problems

Hi,

Are you experiencing an error in the browser or just seeing this in the logs?

Steps to produce the error?

Best,

Joe

11/7/2009 8:23:47 AM
cmillens
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Re: Captcha Problems

User sees no captcha.

Log has the information I posted.

Sometimes it works, sometimes it doesn't. To reproduce this:

  1. configure mojo to use Subkismet captcha
  2. make a contact form
  3. hit the contact form and refresh the page a couple of times.
11/7/2009 8:43:54 AM
Joe Audette
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Re: Captcha Problems

Any other clues?

Does it happen in all browsers or a particular browser?

Can you produce the problem on demo.mojoportal.com?

11/7/2009 1:53:30 PM
cmillens
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Re: Captcha Problems

Sorry it takes so long to get back to this ...

I haven't been able to repro this on demo.mojoportal.com NOR can I repro this under cassini on my win 7 workstation. The server on which the site is running though is server 2008 r2 but the site is in classic mode. see: http://www.pack881.com

Any ideas?

12/14/2010 5:04:09 PM
Jamie E
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Re: Captcha Problems

Hi Joe, we're seeing this periodically in our logs too since going live (it's the only consistent error we seem to be getting). I came here to investigate since I was concerned that perhaps people were trying to break the CAPTCHA, but I don't know what users are seeing on their side. I've never been able to reproduce it locally to troubleshoot what's going on. Sorry I can't provide much more info. I do have the site feedback front and center but no one has complained about any contact form problems yet. Here's what we are getting in our logs:

2010-12-14 14:25:26,779 ERROR mojoPortal.Web.Global - 66.249.67.53-en-US - /CaptchaImage.ashx?spec=uDh8e1aNEZi%2BRFpVlFWTfJyuKmlekrr2FD%2BOvj1JwOskXWp1gVavkqHiAaG09tTa
System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed.
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)
2010-12-14 14:25:26,966 INFO mojoPortal.Web.Global - crypto error trapped and returned a 404 instead of 500 for security reasons
 

Jamie

12/14/2010 5:09:02 PM
Joe Audette
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Re: Captcha Problems

That is web bots, not likely real users, unless you get any real complaints from real users I would treat it as such. I see them in my logs too and it does not trouble me. There are all kinds of things out there manipulating the page and submitting form posts to your site, anything that causes an error logs an error so you can know about it. 

Best,

Joe

3/4/2011 4:02:52 AM
Nguyen
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Re: Captcha Problems

Help me,

I use captcha,
<div class="settingrow" id="divCaptcha" runat="server">
           <mp:CaptchaControl id="captcha" runat="server" />
         </div>

result normally but 
<div class="settingrow" id="divCaptcha" runat="server">
           <mp:CaptchaControl ProviderName="RecaptchCaptcha" id="captcha" runat="server" />
         </div>

result is double :(

Help config captcha

3/7/2011 12:24:26 PM
Joe Audette
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Re: Captcha Problems

I recommend study code for existing features that use the captcha such as the Contact Form, to see how to configure it from code. 

Hope it helps,

Joe

3/14/2011 2:28:47 AM
quynvvn
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Re: Captcha Problems

Thanks Joe

I was config it

4/25/2011 10:01:33 AM
kanguru
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Re: Captcha Problems

I can reproduce this error on my site. It does not seem to be browser specific as I can get it to happen on IE 7, 8, 9 and Firefox 3, 4. It seems to happen at complete random.

Error:

2011-04-25 11:00:45,724 ERROR mojoPortal.Web.Global /CaptchaImage.ashx?spec=8WgU%2bYfd6asJmANHT4VBIY9pwHGoSFuHXqkhvsRaNhU3s%2b8JSMEJjS1tQ6gmFqLU
System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed.
   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)
2011-04-25 11:00:45,895 INFO mojoPortal.Web.Global - crypto error trapped and returned a 404 instead of 500 for security reasons

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