Launch command prompt (as administrator) and run the below command. User should have administrator permissions on the server.

   1: SHUTDOWN /r /f /t 0 /m \\<ServerName> /c "<Description>"

/r         Shutdown and restart the computer.

/f         Force running applications to close without forewarning users.

/t xxx     Set the time-out period before shutdown to xxx seconds.
The valid range is 0-600, with a default of 30.

/m \\computer Specify the target computer.

/c “comment” Comment on the reason for the restart or shutdown.

If there aren’t any issues the system will be restarted

   1: C:\Windows\system32>;SHUTDOWN /r /f /t 0 /m \\xyz /c "Hotfix Installation"