Why is our internal CA not accepted?

Hello.

We use an internal CA based on Step-ce in our company network. I have set up the latest Gitlab on an Ubuntu VM and added the root certificate to the trust store as usual.
After that I created a certificate with Certbot:
certbot certonly --standalone -d gitlab.company.local --server https://teweb.company.local:4443/acme/trenz.local/directory
Then I created a chain:
cat gitlab.company.local.crt root_ca.crt > chain.crt
And edited gitlab.rb: nginx[‘ssl_certificate’] = “/etc/gitlab/ssl/chain.crt”
In the browser the certificate hierarchy is recognized, but the CA is not trusted. Why not?
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Regards,
Thomas

It would suggest that the machine where you are running the browser doesn’t have the CA imported either within the browser itself, or system-wide, or the browser cannot find where the CA has been imported into the trust store.

Firefox, could import a CA into it’s own configuration, with Chrome/Brave, etc, at least for me on Linux, it works fine when imported under /etc/pki/ca-trust. Prior to this I would have had similar situation as yourself. Check/verify the CA certificate has been imported to the correct location on the system where the problem is with the browser.

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We use the CA on Windows Clients with Apache2 based servers with no problems. The CA is distributed via GPO.