NS entries download failed: javax.net.ssl.SSLHandshakeException: Java.security.cert.CertPathValidatorException. Trust anchor for certification path not found

For a few weeks now, xDrip which I have been using as a follower on my tablet (Android 7) has been giving me this error and I can no longer view my daughter's blood sugar levels on xDrip. Can you help me please? Is very important.
Thank you.

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Can you elaborate about this "xDrip"? Is it indeed the application linked by @orangepizza? What endpoint is the application using?

Did you build the application yourself and are you using an endpoint which is under your controle? If the answer to these questions both is "no", then I'm afraid we as a community can't do anything for you, as you as a user can't influence the process. Except complain and request a fix from the application developers and/or used endpoint.

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Some suggestions to work around the problem:

  • use another device [not an outdated android system]
  • update the android software
  • change the CA being used
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ok. the problem is now the following: I want to change the CA used. What and how should I do?

What are the specifics about the system that has the cert?

  • operating system
    [linux, windows, MacOS, ...]

  • [web] service used
    [Apache, NGINX, ...]

  • ACME client used
    [amce.sh, certbot, ...]

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We can't answer this question without the answers op my previous questions and those of Rudy above.

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