The form uses AJAX to save an entry. AJAX is always used through wp-admin/admin-ajax.php.
How did you set the password? Through htaccess? Often it is not a good idea to do it this way.
Hi Marcel, thanks for your reply.
I use Folder Protection from my web hoster -> using htaccess.
What would you suggest to solve this problem? How should I protect the admin area?
In the past, the guestbook worked, there were some entries but since a few months it seems not to work anymore.
I don’t know how to protect the admin area, since I never do that 🙂
Using htaccess for that, is quite a rough method. It is not often advised.
If it is about login and register forms, I use a plugin for that:
https://ww.wp.xz.cn/plugins/la-sentinelle-antispam/
There are more that 100 antispam plugins, so you could take your pick and use one that you like.
It can be a good idea to install the WordFence plugin:
https://ww.wp.xz.cn/plugins/wordfence/
About the “seems not to work”, can you clarify? What doesn’t work?