Messages in the Connector category show errors and warnings related to the connector specified in the Location column. For more details about an error, click the + button in the Message header title. This will expand the message to include details about the error as posted by the DME subsystems.
A message from a connector could for instance say that the LDAP group graph had been read from a certain server.
To see all messages relating to a particular connector, click the connector in the Connector tab, and select the Log panel section. See Log.