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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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.
user9517
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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/ – Валерий Заподовников Oct 03 '21 at 04:07