Captcha Problems

This forum is only for questions or discussions about working with the mojoPortal source code in Visual Studio, obtaining the source code from the repository, developing custom features, etc. If your question is not along these lines this is not the right forum. Please try to post your question in the appropriate forum.

Please do not post questions about design, CSS, or skinning here. Use the Help With Skins Forum for those questions.

This forum is for discussing mojoPortal development

This forum is only for questions or discussions about working with the mojoPortal source code in Visual Studio, obtaining the source code from the repository, developing custom features, etc. If your question is not along these lines this is not the right forum. Please try to post your question in the appropriate forum.

You can monitor commits to the repository from this page. We also recommend developers to subscribe to email notifications in the developer forum as occasionally important things are announced.

Before posting questions here you might want to review the developer documentation.

Do not post questions about design, CSS, or skinning here. Use the Help With Skins Forum for those questions.
This thread is closed to new posts. You must sign in to post in the forums.
11/6/2009 10:51:29 AM
cmillens
Gravatar
Total Posts 15
View Posts

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
Gravatar
Total Posts 18439
View Posts

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
Gravatar
Total Posts 15
View Posts

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
Gravatar
Total Posts 18439
View Posts

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
Gravatar
Total Posts 15
View Posts

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
Gravatar
Total Posts 1203
View Posts
Proud member of the mojoPortal team

Help support mojoPortal!
Add-on modules

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
Gravatar
Total Posts 18439
View Posts

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
Gravatar
Total Posts 1
View Posts

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
Gravatar
Total Posts 18439
View Posts

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
Gravatar
Total Posts 1
View Posts

Re: Captcha Problems

Thanks Joe

I was config it

4/25/2011 10:01:33 AM
kanguru
Gravatar
Total Posts 9
View Posts

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

4/25/2011 10:41:03 AM
Joe Audette
Gravatar
Total Posts 18439
View Posts

Re: Captcha Problems

If you can provide steps to reliably produce the problem I will investigate it as a bug, but if I cannot produce it I cannot investigate it. I know there are bots and things that crawl the web that can produce errors like this in the log, so just seeing it in the log does not concern me or convince me that it happens under normal usage of the site by users.

Best,

Joe

4/25/2011 11:16:38 AM
kanguru
Gravatar
Total Posts 9
View Posts

Re: Captcha Problems

I'm leaning on it being some kind of Server configuration issue, though I can't seem to pinpoint what is causing it. I can only reproduce it on certain Win 2K3 servers.

Example:

http://resources.kanguru.com/Secure/Register.aspx (Fails about 1/2 the time)

http://test.kanguru.com/MojoPortal/Secure/Register.aspx (Works every time)

These are both Server 2K3 boxes running IIS6 .net 4

4/25/2011 11:21:38 AM
Joe Audette
Gravatar
Total Posts 18439
View Posts

Re: Captcha Problems

maybe if there is a problem like the application is recycling frequently it could cause this kind of error, ie if the page loads in the browser and then the application recycles before the page is submitted it might cause this kind of thing. A low memory environment can make it recycle constantly. So if you are seeing a lot of application start and end events in the log in addition to this error it may be a factor.

Best,

Joe

4/25/2011 12:08:00 PM
kanguru
Gravatar
Total Posts 9
View Posts

Re: Captcha Problems

I'll keep an eye out and post any news, hopefully it will help someone else with a similar issue.

You must sign in to post in the forums. This thread is closed to new posts.