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It came to my attention that now the registration anti-spamming requires the users to drag a "red bullet" to a certain location. I tried out the registration page on both chrome and firefox, but couldn't find any red bullet.
@JiaYiyang Thanks for the message. Actually I have no idea about the reason of this isssue. I didn't change anything on the site since months. It is very late here, I will care about as soon as I can.
@JiaYiyang In order to reduce the costs for the site, we have installed a certificate from a free certificate authority yesterday (many thanks to @ChristianPietsch for the installation). As a side effect of a very strict configuration, the process behind our captcha got blocked and the red bullet was no more displayed. This issue has been fixed now and the captcha is working again.
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