I got certificates for my websites and installed them. The websites appear to be working fine via HTTPS through various browsers and get an A rating on SSL Labs. But when I paste links to the websites on Facebook or Google Plus, I get errors.
For example: https://software.kareldonk.com
Tested via SSL Labs, gives an A rating. https://casecurity.ssllabs.com/analyze.html?d=software.kareldonk.com
When posting that URL to Facebook, it cannot read the og properties in the page. Via the Facebook Debugger it reports the following error: "Curl Error : SSL_CONNECT_ERROR Unknown SSL protocol error in connection to software.kareldonk.com:443"
When trying to post the link to Google+, it reports "That link isn't valid. Check it and try again." I suspect that it might also be related to the SSL config.
Is this because certificates from Let's Encrypt aren't fully supported yet by everyone? Or have I missed a configuration setting?