Upgrading CIS 6.2.x host server to advanced security using CIS 19.1+ security server
The CIS 6.2.x host server and CIS 19.1+ security server can use different CA certificate algorithms of since the algorithm has been upgraded on CIS 19.1+. When this happens, the host server cannot directly upgrade to advanced security mode.
The host server and security server must import each others CA to its own truststore. This indicates that they trust each other. Then, a TLS connection can be built for a successful security upgrade.
To import the CA: