Chrome and Safari reports R3 not trusted on a Macbook with Big Sur

[harperjiang]

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: school.bsakoo.com

I ran this command: Use browser to open https://school.bsakoo.com

It produced this output: "school.bsakoo.com" certificate is not trusted

This only happens on a Macbook running Big Sur 11.6.1. On this macbook, Chrome (Version 95.0.4638.69 (Official Build) (x86_64)) reports "school.bsakoo.com" certificate is not trusted. But Firefox works well.

Other machines I have, including Ubuntu+Chrome, iOS+Chrome, iOS+Safari can access the website with no problem.

My web server is (include version): Apache Tomcat 9.0.54

The operating system my web server runs on is (include version): Debian 10, kernel 4.19.208-1

My hosting provider, if applicable, is: Google Cloud Platform

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 1.21.0

[MikeMcQ]

@harperjiang Welcome to the community!

Your server is only sending a "leaf" certificate. It should be sending the leaf and intermediate chain. I think you need to add the certificateChainFile to your server config using the (path)/chain.pem similar to your other two lines for the Lets Encrypt certs.

See for reference:
https://ssl-config.mozilla.org/#server=tomcat&version=9.0.54&config=intermediate&hsts=false&guideline=5.6

Here is a site to check what your server sends:
https://decoder.link/sslchecker/school.bsakoo.com/443

[harperjiang]

Appreciated!