Desk9 Design

Simple Password Protect provides an easy way to password-protect your entire WordPress website frontend. Perfect for development sites, private blogs, or any site that needs basic access control.
Key Features:
<ul>
<li>Global Protection: Protects the entire frontend of your WordPress site</li>
<li>GDPR Compliance: Modal windows for Legal Disclosure and Privacy Policy pages</li>
<li>Secure Authentication: Uses WordPress password hashing and secure cookies</li>
<li>Admin Bypass: WordPress administrators can access the site without password</li>
<li>Customizable Design: Upload logos, customize colors and text</li>
<li>Mobile Responsive: Works perfectly ons all devices</li>
<li>24-Hour Sessions: Authenticated users stay logged in for 24 hours</li>
</ul>
Perfect For:
<ul>
<li>Development and staging sites</li>
<li>Private family blogs</li>
<li>Member-only websites</li>
<li>Temporary site protection</li>
<li>Client preview sites</li>
</ul>
<h3>Support</h3>
For support, please visit the plugin’s support forum or contact the developer.
<h3>Privacy Policy</h3>
This plugin stores a hashed version of your protection password in the WordPress database. It also sets a secure authentication cookie when users successfully enter the password. No personal data is collected or transmitted to external services.
<h3>License</h3>
This plugin is licensed under the GPLv2 or later license. 
https://www.gnu.org/licenses/gpl-2.0.html

Simple Password Protect

Protect your entire WordPress site with a simple password. GDPR-compliant with modal links for legal pages.

itthinx

This plugin redirects 404’s caused by hits on pages that are protected by <a href="https://wordpress.org/plugins/groups/" rel="ugc">Groups</a>.
The redirection settings can be adjusted in Settings > Groups 404 :
Visits to protected pages can be redirected to:
<ul>
<li>a specific post, or</li>
<li>the WordPress login</li>
</ul>
The redirection can also be applied for restricted categories, tags and other taxonomy terms if <a href="https://www.itthinx.com/shop/groups-restrict-categories/" rel="nofollow ugc">Groups Restrict Categories</a> is used.
The redirect status code can be selected among:
<ul>
<li>Moved Permanently (301)</li>
<li>Found (302)</li>
<li>See other (303)</li>
<li>Temporary Redirect (307)</li>
</ul>

Groups 404 Redirect

I know this plugin hasn't been updated in a couple years, but IMHO Groups and its related plugins (like this one) are a hidden gem for WordPress sites. So many people jump to complicated membership plugins when they could do everything they need with Groups. This 404 redirect add-on works like a charm. I'm using it on the latest version of WP 5.x

Perfect.

Redirect 404's when a visitor tries to access a page protected by Groups.

Simple Password Protect vs Groups 404 Redirect