Firstly, you need to set a TCP/UDP port number on ConnLog via File--> Options (Eg. 8001 default port) and press start logging.
Then you need set the log server settings on CAS, you must specify syslog on Facility.
After that, you may test the syslog by clicking Test Syslog button at Alert Locations Section. For more logging options you may select Log Type on Syslog column.