All this time and I never covered this... GPO, gpupdate, gpresult, rsop
GPO
You know GPO, right? The Default Domain Policy is the applied for the entire domain and should override the rest. Put the password stuff in this policy but nothing else.
GPUPDATE
The GPO's will apply automatically but if you need to do it now:
gpupdate /force
gpupdate /force /target:computer
GPRESULT
To see what is being applied, type:
gpresult /r
It shows what server the system is connecting to, what GPO's are applying, what GPO's are not applying and what security-group is being applied. All useful information.
To see more info, use verbose mode:
gpresult /v
Note that the command will only show the USER gpo's. If you want to show the COMPUTER gpo's, the command should be run AS-ADMINISTRATOR.
Or if you need to run remotely:
gpresult /r /scope:computer
GROUPS
Groups are applied on login. If the group doesn't show, logout/login.
RSOP
Since GPO's can overlap, the follow will show what GPO's are winning in case they are fighting: rsop.msc
NET ACCOUNTS
Or a quicky to show password rules: net accounts /domain