I have seen a problem with getting data using XPages or agents from Amazon hosted services because they now are using a Amazon Trusted Root. But it can be others poping up also in the future.
That then recalled my memory about a post I did several years ago
http://xpagedeveloper.com/2017/getting-data-from-an-https-site-in-backend-using-xpages
Is if you are experiencing problems with services hosted on Amazon with The Amazon C1 root cert or Amazon M02 2024 cert you need to import them.
You can find the root certs here https://www.amazontrust.com/repository/
If you need to add if for agents check out this technote
https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0035853
Some error messages that you might see on the console
javax.net.ssl.SSLHandshakeException
java.security.cert.CertificateException
startHandshake
com.ibm.domino.napi.ssl.DominoX509TrustManager
checkServerTrusted
DominoX509TrustManager
Check out Certinfo a small tool that I’ve created to help with getting enddates from certificates
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