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.

Kento

Groups bbPress integrates <a href="https://wordpress.org/plugins/groups/" rel="ugc">Groups</a> and <a href="https://wordpress.org/plugins/bbpress/" rel="ugc">bbPress</a> so that all topics and replies related to protected forums are also protected automatically.
This additional plugin is necessary if you want to run member-only forums with bbPress and Groups. As the topics and replies in bbPress are custom post types, it is not sufficient to protect a forum using Groups. 
The topics and replies in a protected forum would still be accessible unless they are also protected. 
This plugin extends the access restrictions on a forum to its related topics. 
This also applies to replies posted on topics: replies posted on a topic will be accessible to users who can access the topic and the forum only. 
If additional access restrictions are set on a topic, its replies are protected by both the forum’s and the topic’s access restrictions.
<a href="https://www.itthinx.com/shop/groups-forums/" rel="nofollow ugc">Groups Forums</a> is an alternative to using <a href="https://wordpress.org/plugins/bbpress/" rel="ugc">bbPress</a> as your forum system with <a href="https://wordpress.org/plugins/groups/" rel="ugc">Groups</a>.
<h3>Feedback</h3>
Feedback is welcome!
If you need help, have problems, want to leave feedback or want to provide constructive criticism, please do so here at the <a href="http://www.itthinx.com/plugins/groups-bbpress/" rel="nofollow ugc">Groups bbPress</a> plugin page.
Please try to solve problems there before you rate this plugin or say it doesn’t work. There goes a lot of work into providing you with quality plugins!
Please help with your feedback and we’re also grateful if you help spread the word about this plugin.
Thanks!
<h4>Twitter</h4>
Follow <a href="https://twitter.com/itthinx" rel="nofollow ugc">@itthinx</a> on Twitter for updates on this and other plugins.

Groups bbPress

Protect bbPress Forums, Topics and Replies using Groups.

Groups 404 Redirect vs Groups bbPress