Running GPEDIT.msc: Computer Configuration > Windows Settings > Security Settings > Account Policies > Password Policy
I am unable to change any of these policies as they appear to be locked (the icons have a little padlock against them and when I open properties all the options are greyed out)
For what it's worth I'm trying to reduce the password history value.
I'm logged in as admin on the domain controller for the network.
I've googled but can't find anything that fits, anyone got any ideas?