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antp
What kind of device are you using?
On 1st October a root certificate was expiring on devices from 2017 and before, so if they were not updated they can't connect to sites that use Letsencrypt for HTTPS (like imcdb and millions of others).
For example Windows XP and MacOSX 10.12 or older are concerned.
If you can't update your system, you can try using Firefox (a not too-old version) which uses its own set of root certificates.
If you also have that on the main imcdb site, there you can still use the non-https version (as it is not automatically redirected).
https://techcrunch.com/2021/09/21/lets-encrypt-root-expiry/
On 1st October a root certificate was expiring on devices from 2017 and before, so if they were not updated they can't connect to sites that use Letsencrypt for HTTPS (like imcdb and millions of others).
For example Windows XP and MacOSX 10.12 or older are concerned.
If you can't update your system, you can try using Firefox (a not too-old version) which uses its own set of root certificates.
If you also have that on the main imcdb site, there you can still use the non-https version (as it is not automatically redirected).
https://techcrunch.com/2021/09/21/lets-encrypt-root-expiry/