Hello,

I get numerous "General Exceptions" in the log generated by ImageChallenge.captcha.aspx as result of Google/MSN bots scanning the site. I created robots.txt that supposed to cure it but it does not help. Any clues are very appreciated.

Here are the lines from my robots.txt file:

User-agent *

Disallow: /home/admin/

Disallow: /home/DesktopModules/

Here is an excerpt from the Log:

AssemblyVersion: 5.2.2
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL: /home/DesktopModules/HrpSignUp/ImageChallenge.captcha.aspx?captcha=20291F7A77185D13C26181A0162B9F41AF6EB50AEC279B108705E971238B9391607B181D6E1C492F6FD3DFB63DCDC275D5AE85A585ED5FCEDB7DF84C43A76C4981FED2131EE592EB91AB85B357C1F210EC3067B7DDE7D86F994F1AA9385F16289B3CF405E0746A1EDBBA94BE256AEF91B325B06CB6EE6B65ED0541379C4B3BEB&alias=www.hrpersonality.com/home
AbsoluteURL: /home/DesktopModules/HrpSignUp/ImageChallenge.captcha.aspx
AbsoluteURLReferrer:
UserAgent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 49e2636c-1afc-4cfe-ac96-783d3e3a66d2
InnerException: Input string was not in a correct format.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Number.StringToNumber
StackTrace:
Message: System.FormatException: Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at DotNetNuke.UI.WebControls.CaptchaControl.GenerateImage(String encryptedText)
Source:

Thank you!

Alex

 

The issue occurs when Googlebot tried to index the captcha image. To fix the issue, you can add below section into the root.txt of your web site:

User-agent: Googlebot
Disallow: *captcha* # remove captcha images that resolve as pages

You can see this article in http://www.zldnn.com

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