Hi,
I have hosted WP-blog on Ubuntu server and allowed 777 permission to the wpcf7_captcha folder and files as well. still captcha image is not showing on the contact form. When I try to hit following link http://<some IP here>/wp-content/uploads/wpcf7_captcha/1085811208.png, it gives 500 error.
Please help me to resolve this issue.
https://wordpress.org/plugins/contact-form-7/