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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.

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.

Groups bbPress vs Groups 404 Redirect