I'm trying to get a third party application to use the root CA certificate of an SSL proxy - but can't work out how to install the cert for use by all users on CentOS 7

I have the proxy vendor's supplied CA cert in PEM format

I can install the cert in a user's home directory using 'certutil' - and the application works OK - but I would like to do 'something' to install this cert somewhere central that will be picked up by all users

After a bit of Googling, I've found that by default, EL7 uses 'p11-kit-trust.so' (from the p11-kit-trust package) as a drop-in replacement for the nss supplied 'libnssckbi.so' (via 'alternatives') - which, I believe, should be able to pick up CA certs installed under /etc/pki/ca-trust/source/anchors/

Strace'ing the app, I can see it reading the files under /etc/pki/ca-trust/source/... including the required CA cert - but the app fails to connect - but I have no idea what might be wrong ...

Am I missing something obvious here?

Is there an easier way to achieve what I want?

Thanks

James Pearson