On some sites (including this one!), I get the following message: "Your connection to this site is not secure."
In the top left corner of the screen, there is a circle with an "i" which when I click on it gives me the message. How do I fix this?
Well, there's nothing to "fix" on your end. The problem is with the certificate on the site - it is either expired, wrong, or was issued by someone unknown to your browser's store of "safe" certificate issuers.
You could mark the certificate as "trusted" on your end if you don't want to see the message, but that is just masking the issue.
Does this happen on every browser or just certain ones?
Professor Hubert Farnsworth: “Nothing is impossible. Not if you can imagine it. That’s what being a scientist is all about.”
Cubert J. Farnsworth: “No, that’s what being a magical elf is all about.”