Safari Can't Open the Page

Just started getting the message that Safari can't open the page because it can't establish a secure connection to the server, etc.  It was fine yesterday.  Everything else works fine.  I can log into my Xfinity account, and  all web sites load up fine.  

I am able to get to my email using Chrome, which is fine, but I use Safari more often, and it really should work.  

I cleared the cache, log gedout of Safari,  and shut down and re-started the computer but still get the message

Is anyone else having this problem, or have had this problem?