NATS can protect some pages with CAPTCHAs, providing an additional security measure that helps to prevent against automated login attempts.
If your CAPTCHA image is missing from a page, ensure your server has both GD and FreeType installed, and that GD was compiled with FreeType support. Also, make sure the CAPTCHA is enabled on the template.
For more information on CAPTCHA images and how to add them in NATS4, please see our NATS4 Adding a Verification Image wiki article.
See Also
- CAPTCHA -- Wikipedia's CAPTCHA article