This appeared when attempting to view a Kbin image attachment from a federated instance.

“The certificate for media.kbin.social expired on 10/3/2023.”

Viewing the certificate,

  • Validity
  • Not before: Wed, 05 Jul 2023 14:47:26 GMT
  • Not after: Tue, 03 Oct 2023 14:47:25 GMT

I see the one this page on kbin is using is slightly different. The expired one covers kbin.social in addition to *.kbin.social.