Hi @zokia, I took a look at the page you are referring too that redirects to wp-login.php?action=postpass and my best estimate is that there is an error that runs on the wp-login.php?action=postpass page which errors out the request. The wp-login.php is the correct page for the form to submit it’s request to and it should seamlessly redirect you back to the page where you attempted to enter the password but in this case it gets to wp-login.php?action=postpass and fails and doesn’t redirect you back.
I would suggest that you turn on WP_DEBUG in your wp-config.php file and then try this again and you should see that it will return an error on the screen that will give you more information. It’s possible that another plugin is conflicting. I’d be happy to assist in this if needed.
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For your second question, do you mean that you would like to protect the page entirely (without loading any content; i.e. the header, footer, etc.)? If so, this plugin is designed to just work with the built in Password Protection functionality in WordPress but this definitely could be possible. If you could elaborate just a bit more, I could help find a solution for you on that.
Thanks for using the plugin btw and we would love a rating/review if you are enjoying it. Thanks!