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How to change an expiring CA certificate issued by letsencrypt to a new root CA of other than letsencrypt?

gb flag

I was using a letsencrypt certificate for the https connection, but now the DST root CA X3 is getting expired and they added a new path to the root ISRG X1, which is not a trusted root for the IoT device that I'm using. So I need to change the root certificate in my server to a new one. Can anyone help me with a solution on how the new certificate can be added along with the existing one or without the existing one. I'm using nginx in an ubuntu EC2 instance.

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cn flag

The nginx configuration directives ssl_certificate and ssl_certificate_key need to be updated to point to your new files. See the documentation for more detailed information.

Валерий Заподовников avatar
When Sectigo expired this was used to fix the chain (not that is needed since openssl was fixed to conform RFC 4158) https://whatsmychaincert.com/
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