We installed a certificate in a server but we are having problems when accessing from old devices/browsers since last 29 of september when Let's encrypt DST Root CA X3 root certificate expired. I believe the way to solve the problem while we keep using let's encrypt it's forcing the preferred-chain to ISRG Root X1 root certificate.
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Hi, I'd like to help you fix the issues you have with ssl certificates on aws. I have worked on these kind of issues before and have a lot of experience working with aws and linux servers.