Hi,

I'm utilizing the Telerik captcha control in a SharePoint environment as a security measure to protect forms against spamming. I have 3 layers in my setup. There's a Dev server (DEV), integration server (SIT) and ultimately the user acceptance test server (UAT). Although I have the exact same code, deployed to all the 3 environments, I get different behavior when it comes to Audio Captcha.

On my Dev, I'm able to hear the Audio Captcha once I click on the "Play Audio Code" link. On the other 2 servers, nothing happens. I investigated this further by finding the "guid" passed to the Telerik.Web.UI.WebResource.axd?type=cah&guid={guid} handler.

When I hit this handler from my dev box, I get the audio file. However, hitting the same handler (with a different guid of course) results in the following error in SIT & UAT:

CaptchaAudio Exception

RadCaptcha was not able to generate an audio code Please check the following:

• Make sure that directory named RadCaptcha exists in the application’s APP_Data folder
• Make sure that you have specified a valid path to the directory containing the audio (*.wav) files. Use CaptchaImage . AudioFilesPath property to set the path to the folder containing the files..
• Make sure that there is an audio file for every possible character that might appear in the Textcode. The audio files must be named “Char”.wave. i.e. A.wav, B.wav, C.wav, 1.wave etc.
• Make sure your application is running in Full Trust environment

Stating the obvious, I’ve checked all the above points and everything looks good to me.

Here are a few more points to consider:

1. The same .wsp package has been deployed to all the servers which implies the following
   1. Audio files are copied to a folder called “RadCaptcha” that exists under the LAYOUTS folder (I’ve verified this on all the servers and the audio files DO exist)
   2. The code deployed is identical
   3. I can hit the audio files externally from IE by referencing their location under /_layouts/
2. The Web.Config are identical
   1. I swapped the web.configs between DEV & SIT, nothing broke/worked
   2. I manually inspected the various sections (trust levels, etc) between the DEV & SIT web.configs, they are identical
3. Below is the section where I configure the CAPTCHA in my code. I assume it’s correct as this works on DEV

// Add captcha to the right column

                    captcha = new RadCaptcha();

                    captcha.ID = "captcha";

                    captcha.ErrorMessage = "error";

                    captcha.EnableRefreshImage = true;

                    captcha.CaptchaAudioLinkButtonText = "Play Audio Code";

                    captcha.CaptchaImage.EnableCaptchaAudio = true;

                    captcha.CaptchaImage.AudioFilesPath = "/_layouts/myproject/forms/RadCaptcha";

// I added the line below later on to debug this issue – didn’t seem to have any effect

                    captcha.CaptchaImage.UseAudioFiles = true;

Any help is greatly appreciated,

Ali Pourmoghaddam