Security and TLS failures

For the site fracturebook.ota.org, I am getting reports that connections are failing due to an expired certificate, and trying to access the “Security” tab in the Backendless admin gives me this error:

Hi Jacob,

I checked the certificate for https://fracturebook.ota.org/, and it is valid:

I also ran a check here:

Can you open your site and check if you get a certificate error?

Regards,
Mark

It seems to be working now. I just want to make sure that there isn’t a time lag in renewing that may cause this to happen in the future.

Good, thank you for checking.

No, there is no renewal lag. I suspect the issue with the DNS somewhere on the side of the visitors who experienced the issue.