reboot server

have you edited the crontab file? if it is rebooting 5 times a day then there is an error in this somewhere

00 04 * * * root /sbin/reboot

works for me to reboot server at 4am every morning on my debian server

if you are in windows you can use a program called putty to access your server.
or use filezilla and edit the file through the path /etc/cron.d

i use the putty method if im on windows !
G edit and nano
Scheduling Backup Jobs using at and crontab in debian linux crontab at files format or syntax

:rikjaard1:

today i changed the cronjob in my debian server

from the keyboard or ssh - putty
type these commands

cd /etc

The above command will change directory to /etc

type

ls

this is list command to see files in that directory ¬

to look in a file type command below,

more crontab

now you can read the crontab _

if you want to edit type

nano crontab

After editing hold control key + o
Then enter key
Finally hold control key and x

Have fun