3281818 - No possibility to Trust Diagnostic Agent after regenerate certificate due to "iaik.security.ssl.SSLException: Peer sent alert: Alert Fatal: certificate unknown" - SAP Solution Manager 7.2

• After generating a new certificate at Infrastructure Preparation / 2.3 Diagnostics Agent Authentication, you notice that you cannot trust the Diagnostics Agents (DAAs).
• In the SMDSystem.log files you found the error message:
  " Error      Connecting to SMD server p4s://<host_name>:<port>failed - error counter: 22091 [EXCEPTION]
  javax.naming.NamingException: Exception while trying to get InitialContext. [Root exception is com.sap.engine.interfaces.cross.DestinationException: Cannot establish connection with any of the available profiles. Check if server is started, access point for the protocol is available, and IP/Host name is accessible on the network. 
  URL=p4s://<host_name>:<port>, protocol=P4S(ssl), Reason: com.sap.engine.services.rmi_p4.P4IOException: Cannot open connection to host: <HOST_IP and port: <PORT>;]
  (...)
  Caused by: com.sap.engine.interfaces.cross.DestinationException: Cannot establish connection with any of the available profiles. Check if server is started, access point for the protocol is available, and IP/Host name is accessible on the network. 
  URL=p4s://<host_name>:<port>, protocol=P4S(ssl), Reason: com.sap.engine.services.rmi_p4.P4IOException: Cannot open connection to host:  <HOST_IP and port: <PORT>;
  (...)
  Caused by: com.sap.engine.services.rmi_p4.P4IOException: Cannot open connection to host:  <HOST_IP and port: <PORT>
  (...)
  Caused by: iaik.security.ssl.SSLException: Peer sent alert: Alert Fatal: certificate unknown" 

SAP Solution Manager 7.2

iaik.security.ssl.SSLException: Peer sent alert: Alert Fatal: certificate unknown; available profiles , KBA , SV-SMG-DIA-SRV-AGT , Agent Framework , Problem