The Symantec Endpoint Protection Manager (SEPM) reports Unexpected Server Errors, and you see errors related to ScanTableHandler in scm-server-?.log matching any of the following:
SEVERE: ScanTableHander insert exception:String or binary data would be truncated.
java.sql.BatchUpdateException: Cannot insert the value NULL into column 'EVENT_SOURCE', table 'dbo.AGENT_SYSTEM_LOG_1'; column does not allow nulls. INSERT fails.
SEVERE: in: com.sygate.scm.server.logreader.sep.BatchLogHandler java.sql.SQLException: Invalid data for the specified data type. Column Index: 15, type=4, value: www
WARNING: Error during AV record processing: com.sygate.scm.server.logreader.ParseException (7): Invalid log record: String found instead of integer.
This is caused by malformed data coming from the endpoints. Typically this is seen with older versions of the SEP client, particularly pre-14.3 RU6 Mac clients.
Update all endpoints in the environment to 14.3 RU8 or newer.