Canon LBP7210Cdn Manual page 700

If [On] is selected for [Access Logs], select the type of log that you want to obtain.
[Rejected TCP/IP Print
Jobs]:
[Rejected SNMP
Monitoring/Setting
Changes]:
[Rejected Multicast
Discoveries]:
Click [OK].
The security access log is recorded when access from a user who
is rejected to perform the TCP/IP printing is blocked.
The security access log is recorded when access from a user who
is rejected to monitor/change the SNMP setting is blocked.
The security access log is recorded when access from a user who
is rejected to perform the multicast discovery is blocked.