Update: I've opened a case with Aruba Support and received little traction on the issue. I've done some more testing on my end and I believe the issue has to do with no CA bundle being installed on the Airwave server.
I run the following command:
openssl s_client -host <airwave server> -p 443
and I immediately receive an error num: 20 - unable to get local issuer certificate and the certificate chain that is returned by the server is the actual server certificate itself. I can run the same command directly on the Airwave server, pointing the host to localhost and I get the same results.
The forementioned link that details installing a third-party certificate does not reference an intermediate certificate nor is an SSL.conf file referenced in the Apache config on the box itself. I tried to manually configure an SSL.conf file but an Apache restart failed.
We're planning a firmware upgrade early next week - not sure if this will make a difference or not, but the code we're running is only weeks old.