Stations restart after SSL update

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Once every 3 months we must update the SSL certificate for our Linux server.
Everything is fine except the fact that we are unable to restart ALL of the stations that are currently on our server.
Restarting Centova will not do this. The only way to restart the station is to reboot the server. We are trying to avoid that.
Please help. We would like to make a cronjob or a script for this issue, but we cannot do that without the stations restart command.