SSL Hound is a great tool in supporting the open web. It doesn't matter (except when it does) what type of community you build, when certificates expire or are misconfigured, it can be a huge disruption. SSL Hound can make sure that your mastodon instances are providing safe and secure connections to each other and the users who depend on them.
What Does SSL Hound Do For Your Mastodon Instance? It makes sure that everything is configured correctly and gives your users confidence that it is secure. Also, it gives you peace of mind that your instance is a good citizen of the federated server network.
What If I Use Let's Encrypt? That's great! Let's Encrypt has changed the web for the better. SSL Hound can help you make sure that your certificates are installed correctly and in the right places. When it comes time for those certificates to expire, it can help you make sure you didn't miss anything with certificate updates and replacements.
How exactly would I use this? Using SSL Hound is a great, cheap way to get some reassurance that your instance handling secure connections correctly. All you need to do is sign up and enter all of the ways that people interact with your instance.
For most instance operators that includes the base domain like sslhound.com and the www domain like www.sslhound.com. Sometimes website and media files are served from a Content Delivery Network like media.sslhound.com. If there are 3rd party websites and APIs in the mix, it can be good to monitor them as well.
Have experience with this? Yes! We're a huge fan of activity pub and use Mastodon ourselves.