Every time, an online request is done, the server time is compared with the local computer time. The local time zone is considered in this check. If the time difference is more than 1 day (default setting), then the online check terminates with error 3014.
You can define the time difference in the project.config file with the setting TicketValidMinutes.
To ensure, that the local PC has not modified the date/time you can either:
•make a regular online check
•make an individual online check
•activate the evaluation version
and combine the online checks with the inbuilt option (offline) to check for system date modification