MaxScale uses Connector-C version 2.3.3 to connect to backend clusters. As described in
MXS-1462, MaxScale successfully connects with TLSv1.2 whereas C/C uses TLSv1.0. This is not the expected result as the highest available encryption version should be used.
As is explained here, MaxScale and Connector-C use different ciphers to connect to the same server.