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ImageChallenge.captcha.aspx System.FormatException is flooding the log

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Created by host in 7/17/2012 7:44:06 PM


We received several reports about log issues of ImageChallenge.captcha.aspx. For example:

AssemblyVersion: 6.2.0
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL: /desktopmodules/dnnarticle/ImageChallenge.captcha.aspx?captcha=D6D87243DABF349C49DC324DFC2B66F8E1ADDBD1356F4140AA170E03C77B055A91DFA47C90A054E011E6FE732E95BB7767BC671D2428C808FC5C27E736428EBDEB2CFCBDF70FBFBBCD8C8B28DFDF8436FFACF3F9997CF30A9E04753C212D362C64EFCF66662B11FC17D014B5028FAF02895DB78AE8C6F4CDF84EE10D249D29B5F46D96EA7E4109A5F03DFFDC0BFD2A2C94CBFE8D0B3A98F892585E18EFBDEBB9AF3BF3C6&alias=www.tarighat-music.com
AbsoluteURL: /desktopmodules/dnnarticle/ImageChallenge.captcha.aspx
AbsoluteURLReferrer:
UserAgent: Googlebot-Image/1.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 58496425-d653-4fcd-aef3-cbec0a5bf8d9
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 )

 

 
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



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