Some features are closely linked with the system time, such as logging and certificate management. By manually setting the time, the appliance will not be integrated correctly into the IS. Moreover, simply using the internal clock does not guarantee that there will not be any drift in the long run.

R27 | SNS-SMC | Synchronize system time
NTP synchronization should be enabled on SNS firewalls and several reliable time servers should be used, in line with the technical note Security recommendations for the implementation of log systems (in French).