I got a certificate error in my browser (Firefox) just now when I tried to access the forum. I fixed it by adding the site as an exception in Options/Security/General/Exceptions.
looks like the cert had a common name of *.discourse.org for a few minutes. now it’s back to normal. can you try removing the exception and accessing the forum again?
I took the exception out and I can now access the site without any error.
ok great! let me know if it happens again. I think the Discourse team made a mistake but they were very quick to fix it. I didn’t even had time to finish writing the email I was about to send them