There's a change coming in January 2020 which could result in problems with HTTPS sites.
https://www.entrustdatacard.com/blog...eprecating-tls
Your server needs to support at least TLS 1.2, and preferably also the current 1.3. If not, by early next year, people with modern (and updated) browsers will refuse to load your site.
If you have a HTTPS site that's a few years old, you may need to upgrade the software, or modify your config.
Wouldn't hurt to give everything a once-over anyway; my server already supported TLS 1.2, but I upgraded Apache so that I could enable TLS 1.3.