How to install new certificate in HPUX client store?

We have a HPUX server that talks to a web service. We recently updated the web service certificate to a new SHA256 cert that has an updated intermediate cert. The HPUX server is now unable to connect because it cannot validate the cert chain due to it not having the new intermediate CA cert.

I tried importing it to /opt/java1.5/jre/lib/security/cacerts which is successful but the system doesn't read from there apparently.

I tried copying the .pem format to /opt/openssl/certs and that did not work either.

Any suggestions? I have a case open with HP and so far they don't have answer after 3 weeks. I can't imagine this is a difficult task?