You can set this on any domain controller in your domain. Open up the domain security policy and browse to the password policy. Change the maximum password age to be 45 days. This will only effect services on your servers if you are running services off domain accounts. If you are, you will need to log onto those servers every 45 days and reset the service passwords also. It is good practice to change your passwords every 45 days, but having the system force you can be a headache with domain admin accounts. I recommend setting your own domain admin policy and manually changing them every 45 days.
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