NOTATIO

It's still there for me.

Again Notation came up normally this morning. No announcement.

You are more lucky than me then.

Less lucky this morning, the announcement is back.

I only got the message that first day (when basically everyone posted about it).
It hasn't returned so far. *fingers crossed*

Today Notatio opened without the announcement.

I’ve just got the alert after a couple days not getting it.

When the alert is not got it probably only means the browser remembers we have given permission to go on notwithstanding the lack of a certificate. If you go to the website with another browser or maybe from a different wifi, you’ll get it again.

Hello!

Yes, the certificate for secure SSL connection has expired. It is still SSL connected, but the certificate is not any more valid.  

I am thinking of moving the forum to the another, more smooth hosting, so that I don't need to pay for a certificate that can be get for free (Let's Encrypt), but it will take a lot of hours.

EDIT: The new valid certificate has been installed. Perhaps all users were logged out.