DCoda

This plugin is only supported on PHP 5.2 or greater.
 
MembersBlog easily allows you to lock down your blog to members only. 
Unauthenticated visitors who try to view the blog content will be forced to the login page , or presented with an browser login prompt if they try to view the feed.
When the blog and feed are locked down to subscribe to a feed using a feed reader a username and password must be supplied in the url:
<pre><code>http://{username}:{password}@{feed url}
</code></pre>

If you are having trouble and cannot find the answers in the <a href="http://membersblog.dcoda.co.uk/help/faq/" rel="nofollow ugc">FAQ</a> you can post your support questions to the <a href="https://wordpress.org/tags/members-blog" rel="ugc">WordPress Support Forum</a>
If you find MembersBlog useful please rate it at <a href="https://wordpress.org/extend/plugins/members-blog/" rel="ugc">wordpress.org</a> and please consider making a <a href="http://membersblog.dcoda.co.uk/donate/" rel="nofollow ugc">donation</a> to help us set aside more hours to maintain MembersBlog
MembersBlog is written by <a href='http://dcoda.co.uk' rel="nofollow ugc">dcoda</a>
You can check out our other plugins <a href="https://profiles.wordpress.org/users/dcoda/" rel="nofollow ugc">here</a>
If you require a custom plugin you can contact us <a href="http://dcoda.co.uk/contact/" rel="nofollow ugc">here</a> and maybe we could write it for you.
<h3>Copyright</h3>
(c) Copyright DCoda Limited, 2007 -, All Rights Reserved.
This code is released under the GPL license version 2, available here:
<a href="http://www.gnu.org/licenses/gpl.txt" rel="nofollow ugc">http://www.gnu.org/licenses/gpl.txt</a>
There are so many possibly configurations of installation the plugin can be installed on we limit testing to a PHP 5.2+ Linux platform running the latest version of WordPress at the time of release but it is released WITHOUT ANY WARRANTY; 
 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

MembersBlog

Lock down all your posts and pages so only members can access them

roehler

Private Website – Login Required is a simple and straightforward WordPress plugin designed to restrict access to your website. By activating this plugin, users must be logged in to view any content on your site. This is ideal for websites that host sensitive or exclusive content and want to ensure that only authenticated users can access it.
There are no complicated settings to configure. Simply activate the plugin to enforce the login requirement and deactivate it to remove the restriction.
This plugin was developed by <a href="https://roehler.nrw" rel="nofollow ugc">Robin Oehler</a>.
<h3>Privacy Policy</h3>
Private Website – Login Required uses <a href="https://appsero.com" rel="nofollow ugc">Appsero</a> SDK to collect some telemetry data upon user’s confirmation. This helps us to troubleshoot problems faster & make product improvements.
Appsero SDK does not gather any data by default. The SDK only starts gathering basic telemetry data when a user allows it via the admin notice. We collect the data to ensure a great user experience for all our users.
Integrating Appsero SDK DOES NOT IMMEDIATELY start gathering data, without confirmation from users in any case.
Learn more about how <a href="https://appsero.com/privacy-policy/" rel="nofollow ugc">Appsero collects and uses this data</a>.
<h3>Bugs & Feedback</h3>
Your feedback is important to me. If you find mistakes, have wishes, ideas, or suggestions, please send an email to <a href="mailto:mail@roehler.nrw" rel="nofollow ugc">mail@roehler.nrw</a>.
Legal notice (German): <a href="https://roehler.nrw/impressum/" rel="nofollow ugc">https://roehler.nrw/impressum/</a>
You are free to use it on any website across countries to protect the privacy of your users.
Note: Activating this plugin cannot guarantee that your website is completely compliant with GDPR. When using Google Analytics, Facebook pixels, or other similar tools, additional measures may need to be taken.

Private Website – Login Required

This plugin requires users to be logged in to view the website. Activate the plugin to enforce login, and deactivate it to remove the restriction.

MembersBlog vs Private Website – Login Required