How did you install the second vRA ? Did you just deploy the OVA and left the appliance there ?
Do both forward and reverse DNS work for the second appliance ?
The vcac-server service doesn't work in the secondary vRA appliance.
And also I can't start this service with the following message: "Property csp.host is set in /etc/vcac/security.properties, but is empty"
I didn't customize the secondary appliance just after ova file. I deployed the vRA appliance again but I faced the same error with this.
the message on vcac-server not starting is OK, as the second VA is not yet configured.
It' gets configured during the join cluster operation
the clustering process will report stuff in "/var/log/messages" and "/var/log/vmware/vcac/vcac-config" files.
you can login to the console and monitor those on the 2nd and Ist VAs, see what the actual error is.
or post them here in a zip.
-on the networking side, make sure to check not onlu full DNS resoltution between the nodes but also with short-names;
-also check whether you have mapping to localhost of the load-balancer VIP in the /etc/hosts file