If you've been using Let's Encrypt for a while, you may have noticed that their certificates are signed by a root certificate titled DST Root CA X3. That root certificate is set to expire in a few hours. Any certificates still signed by that root will no longer be valid. But luckily, that shouldn't form a problem for most Let's Encrypt users. For a while now, new SSL issuances by Let's Encrypt have issued certificates against DST Root CA X3 (the one that is about to expire) and ISRG Root X1.

Keeping an eye on your site and sending you a notification when it goes down is one of the core features of Oh Dear. Under the hood, we'll send a request to your site and take a look if the response code is in the 200-299 range, which is the default response code range to indicate that everything is ok. Some of our users are monitoring password protected sites. In such cases, the web server might reply with status code 401 (unauthorised).

Like most SaaS products, Oh Dear is a living platform. We add new features proposed by our users, fix bugs that get reported, and regrettable also sometimes introduce new bugs. Most users use email to communicate with us. Even though sending an email is often perceived as friction-free, it can be a minor hurdle. We've introduced a little support bubble at the bottom of every page to make it easier for our users to pass us feature requests and report bugs.