You will see this error in the <BPPM_Agent_Install>/Agent/pronto/logs/debug/TMARTAdapter.log on the ISN.
ERROR 11/01 09:37:47 TMARTAdaptor [Thread-463658] 600004 ServletConnector.connect() TMART_LOGIN : Error while connecting to TM ART Server
javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure
You will also see this popup when attempting to Edit the Adapter from the BPPM Admin UI.
TM ART 4.2 can connect to all supported levels of BPPM and TSIM with one exception which is that TM ART 4.2 Service Pack 5 is not compatible with BPPM 9.0.x due to the OpenSSL 1.0.2 implementation in TM ART 4.2 Service Pack 5.