CAPTCHA component

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I use form authentication mode to verify users like:
<authentication mode="Forms">
<forms name="MyCookie" loginUrl="Login.aspx" defaultUrl="Home.aspx"
protection="Validation">

and I want to use a CAPTCHA component form
http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx

But I find this component can't display the image in the login.aspx, but it
can display well in other pages like home.apsx ...

What's the problem?

I must use the CAPTCHA component in login.aspx

 

[bruce barker]

your CaptchaControl.aspx page need anonymous access (no security) or it can
not be displayed until the user has logged in (will just redirect to the
login page)

-- bruce (sqlwork.com)

 

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Thanks to your answer.
But how to make CaptchaControl.aspx anonymous access in web.config?